K3 Diversity Rocks!
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2009 ARRL DX CW results are just out and I set a new US record for
SOSB/160. Final result was 428 Qs by 79 mults and the closest multi-multi was K1XM with 430 by 76 (at W1FJ using a 4-square on salt water). Thank you Elecraft for diversity...I'll never use any rig without it! 73, Bill W4ZV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Bill,
What were you using for receive antennas? I think a number of us would be interested. Just how much of an improvement do you find with diversity reception? Is it possible to quantize? I have a second receiver on order at this very moment and am looking forward to a new season on top band. Sadly I was on twenty for the ARRL test this year. A good number of people in EI are purchasing K3s at this time. It not only has about the best performance but offers probably the best value with the opportunity to build up the radio gradually. Meanwhile they are working on the Noise Reduction algorithm as a design engineer himself tells us. Elecraft is rocking. 73 Doug EI2CN -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Bill Tippett Sent: 13 July 2009 20:10 To: Elecraft Reflector Subject: [Elecraft] K3 Diversity Rocks! 2009 ARRL DX CW results are just out and I set a new US record for SOSB/160. Final result was 428 Qs by 79 mults and the closest multi-multi was K1XM with 430 by 76 (at W1FJ using a 4-square on salt water). Thank you Elecraft for diversity...I'll never use any rig without it! 73, Bill W4ZV ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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EI2CN wrote: > 1. What were you using for receive antennas? I think a number of us would be interested. 2. Just how much of an improvement do you find with diversity reception? 3. Is it possible to quantize? I have a second receiver on order at this very moment and am looking forward to a new season on top band. Sadly I was on twenty for the ARRL test this year. Your questions in order: 1. My main TX array is similar to a 4-square and my RX antennas are 7 Beverages ranging from 600-1100'. I have my K3 set up so I normally listen on both (i.e. in diversity) but I can also quickly switch between the TX array only or the Beverages only. I also sometimes use an inverted-V for "local" stations in NA/SA instead of the vertical array. 2. Diversity can be very helpful to fight the QSB characteristic on 160. I've sometimes heard signals switching back and forth between ears several times within a second. I believe this allows me to copy calls and exchanges the first time without the need for repeats. It also helps me copy callers from multiple directions simultaneously. 3. My QSO score reduction was from 435 claimed to 428 final which is fairly good (1.6% error rate). Considering how weak signals can be on 160, the unique power exchange is often a challenge to copy correctly. I miscopied 1 call and 6 power exchanges. The comment from OL0W below is not necessarily very scientific but FWIW... "Only for fun, when the band was already closing, I decided to try what I will be able to work with QRP. Using longer callsing OK1DSZ and the power reduced to 5W I spend about 10 minutes calling several east coast big guns. The award for the best ears goes to W4ZV, who was worked as easily as with the kilowatt earlier in the night. K8PO and W2FU were worked with several repeats. The others just kept CQing without any reaction with exception of K1TTT, who apparently heard something, but not enough for the QSO." > A good number of people in EI are purchasing K3s at this time. It not only has about the best performance but offers probably the best value with the opportunity to build up the radio gradually. Shhhh!!! We don't want to publicize our competitive advantage. ;-) Tim KT1D corrected me on K1XM's location...it's actually W1KM where he was one of the ops and it was an all K3 operation. 73, Bill |
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In reply to this post by Doug Turnbull
> Just how much of an improvement do you find
> with diversity > reception? Is it possible to quantize? Hi Doug. I'm not (yet) on topband but reckon that diversity is worth a few dbs (up to maybe 5 dB?) on the other bands, particularly on 30m where my RX antenna (a 30m fullwave wire loop) works best. Lately I've been trying WSPRnet and find that, on 30m anyway, I can hear QRP sigs in EU down to 0.1 Watt by greyline while the Europeans haven't yet heard me below about 1 W out. My TX antenna on 30 is a rotary wire dipole at 13m AGL on the tower at the far end of 100m of RG213, where I probably lose a couple of dB. The RX loop is up in the trees only 20m away from the shack, also fed with a shorter hank of RG213. I haven't yet tried swapping RX and TX antennas over. 73 Gary ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bill W4ZV
It's funny that you mention this today as I was going to post something
about it as well. I got to try diversity receiving yesterday and what a world of difference in copying through QSB. Like last year, I'm operating portable out in a tent gazebo in my front yard again this summer. I threw up a 66' doublet fed with ladderline in a tree around 35' up. As I was operating Saturday, I was continually frustrated at not being able to copy very well through some slow QSB on 40m and 30m. I was operating QRP as were my contacts. On Sunday I decided to try diversity receiving by using a 350' spool of 14g wire I had sitting around. So I stretched it down the side of my lot about 4-5' above the ground in the trees and brush and plugged it into the RF IN port. Admittedly being short for a good beverage antenna, I was absolutely amazed at how well I could copy weak signal CW. Whether fast or slow QSB, I could hear the signal float between my ears and it was always there. I would wait for slow QSB and turn off diversity and hear the sig fade. I also found it more pleasurable to listen as well. With narrower DSP filtering, diversity did not sound as harsh or ringing with all the QRN we had here over the weekend. I will continue to play with it through the summer, but I am a firm believer in diversity receiving. I will more than likely look at other, more permanent receiving antenna solutions for the fall when I have to move back indoors. I am by no means a contester of any sort (I'm still working on getting my code speed reasonable) but I can see how it would be very beneficial for contesting and weak signal work. Yes, thanks Elecraft for getting a rookie to try something new and have fun using it! 73, Dave W8FGU Bill Tippett wrote: > 2009 ARRL DX CW results are just out and I set a new US record for > SOSB/160. Final result was 428 Qs by 79 mults and the closest > multi-multi was K1XM with 430 by 76 (at W1FJ using a 4-square on salt > water). > > Thank you Elecraft for diversity...I'll never use any rig without it! > > 73, Bill W4ZV > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Dave Van Wallaghen wrote:
> It's funny that you mention this today as I was going to post something > about it as well. I got to try diversity receiving yesterday and what a > world of difference in copying through QSB. I have been using polarization diversity on 20M CW. One antenna is a 4 el yagi at 45 feet and the other is a ground plane cut for 17 meters. I also hear the signal moving back and forth with QSB, but there seems to be another advantage as well. One problem I have copying weak CW signals is that sometimes a bit of noise comes along and causes me to miss a letter in a call, for example, and I have to wait for the guy to send it again. During a QSO it's less of a problem because the brain fills in letters and words from the context, but sometimes I am missing almost every other letter and this mechanism breaks down. Possibly the noise is picked up differently by the antennas...I'm not sure, but when diversity is on, the signal seems to stand out, less damaged by the noise. Far fewer letters get crunched -- it makes it much easier to copy. It's also helpful when I hear a signal loud in the right (vertical) ear and weak on the left (beam). Then I know the beam needs to be turned, even before I hear the guy's call! -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bill W4ZV
Vic wrote:
I also hear the signal moving back and forth with QSB, but there seems to be another advantage as well. One problem I have copying weak CW signals is that sometimes a bit of noise comes along and causes me to miss a letter in a call, for example, and I have to wait for the guy to send it again. During a QSO it's less of a problem because the brain fills in letters and words from the context, but sometimes I am missing almost every other letter and this mechanism breaks down. Possibly the noise is picked up differently by the antennas...I'm not sure, but when diversity is on, the signal seems to stand out, less damaged by the noise. Far fewer letters get crunched -- it makes it much easier to copy. ----------------------- Yes, that is exactly what I heard as well. The sound was much richer and full and the sigs just seemed to pop up out of the noise better. Doing A/B comparisons between diversity and single receive I heard much more ringing in narrow DSP filtering on single receive that combined with the noise would tend to bury some signals. But with diversity reception, the signal would seem to pop out more and sound better with much less ringing or harshness. 73, Dave W8FGU ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Are you gentlemen using the second KAT3 port or are you using the AUX RF
path? I tried using the KAT3 port and found that with other stations around my COR's were switching on me when the other station got into us a little bit. Their antenna was as loosely coupled to ours as I could have gotten it in the space we had. There were two windoms both on the same string between trees so they were end to end of one another tip to tip. Then our other antenna was 90 degrees off and when we TXed I found that it would get into the other port and operate the CORs that way as well. Does this possibility go away when you come in through Aux RF? ~Brett -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Dave Van Wallaghen Sent: Tuesday, July 14, 2009 6:39 AM To: Vic K2VCO Cc: Elecraft Reflector; Bill Tippett Subject: Re: [Elecraft] K3 Diversity Rocks! Vic wrote: I also hear the signal moving back and forth with QSB, but there seems to be another advantage as well. One problem I have copying weak CW signals is that sometimes a bit of noise comes along and causes me to miss a letter in a call, for example, and I have to wait for the guy to send it again. During a QSO it's less of a problem because the brain fills in letters and words from the context, but sometimes I am missing almost every other letter and this mechanism breaks down. Possibly the noise is picked up differently by the antennas...I'm not sure, but when diversity is on, the signal seems to stand out, less damaged by the noise. Far fewer letters get crunched -- it makes it much easier to copy. ----------------------- Yes, that is exactly what I heard as well. The sound was much richer and full and the sigs just seemed to pop up out of the noise better. Doing A/B comparisons between diversity and single receive I heard much more ringing in narrow DSP filtering on single receive that combined with the noise would tend to bury some signals. But with diversity reception, the signal would seem to pop out more and sound better with much less ringing or harshness. 73, Dave W8FGU ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Dave Van Wallaghen
Does it ever!
My best Diversity setup is on 40m: a Cal-Av 2D-40A (full-size 2-el horizontal phased array with excellent gain and F/B) at 110' and a full-size 4-square vertical array with 60 ground radials per element. While effective for receive (highly directional and quiet), the 4-square can't hold a candle to the Cal-Av on either receive or transmit (that was also true when the beam was a 40-2CD at 50'!) When conditions are good, the Cal-Av is significantly louder on receive than the 4-square. I've seen differences ranging from 5-20 dB. The DC-grounded design make the Cal-Av an unusually quiet horizontally-polarized antenna, but under some circumstances, such as very heavy rain or snow static, the 4-square can be quieter. There's absolutely no comparison on transmit: the beam is always superior. Before trying Diversity, I only used the 4-square when noise on the beam was really bad, or more often to work stations off the back of the Cal-AV, which has about 20 dB F/B. I was skeptical about how much it would help to use the antennas in Diversity, and wasn't at all prepared for how effective the combination would be. It's made a huge difference in my contest production on 40m. I'm consistently running at higher rates on 40m than ever before, with fewer mistakes and fewer fills. As others have pointed out, Diversity is terrific for dealing with QSB. In the vast majority of cases, when a signal fades on one antenna I can still hear it on the other antenna. I've also found Diversity to be effective during static crashes -- the signal coming from one antenna will get wiped out, but I'll still hear it on the other (not 100% of the time, but often.) Diversity is also a great help for sorting out stations in big pileups. My 2-el is pretty loud to EU, so I can generate deep pileups. When stations of about the same signal strength are on top of each other, it's pretty-much impossible to separate them. But often the two signals will arrive differently on the two oppositely-polarized antennas, and that small difference can be just enough for me to pull out one of the calls or at least a few letters. Finally, when I'm running EU and a weak US station calls me off the back of the beam, I can flip the 4-square to SW and hear the station without compromising my signal to EU (I can also continue to transmit on the beam while switching the 4-square back and forth, something I couldn't do when I used to parallel the antennas.) I haven't tried Diversity on 160m and 80m all that much. I have a dual 580' NE/SW beverage (more like NNE/SSW), but my transmit antennas are modest: an 80m delta loop at 70' and a trapped 160m/80m inverted vee at 90'. I can't generate big pileups where Diversity would help me sort out calls. Also, I rarely run on 160m and the rate is considerably lower on 80m than on 40m. Consequently, I'm usually S&Ping another band on the second radio, which eliminates use of that ear for Diversity. Another reason for avoiding Diversity is that the transmit antennas usually pick up a lot of noise. Under poor conditions noise from the transmit antennas in one ear becomes distracting and it's best to listen on the beverage only. Under less noisy conditions, I think Diversity could be helpful for combating QSB and QRN, as well as hearing weak stations off the back of the beverage. I'll have to experiment with that some more. 73, Dick WC1M ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Howard
Brett Howard wrote:
> Are you gentlemen using the second KAT3 port or are you using the AUX RF > path? I tried using the KAT3 port and found that with other stations around > my COR's were switching on me when the other station got into us a little > bit. Their antenna was as loosely coupled to ours as I could have gotten it > in the space we had. There were two windoms both on the same string between > trees so they were end to end of one another tip to tip. Then our other > antenna was 90 degrees off and when we TXed I found that it would get into > the other port and operate the CORs that way as well. > > Does this possibility go away when you come in through Aux RF? I'm using AUX RF. It has a COR too. I suffered a malfunction in this area which I really do not fully understand and the COR relay was damaged. After replacing the relay and making a few updates to my (beta test version) KRX3 that were recommended by Elecraft support, I am still a little nervous. So I added back-to-back diodes across the switch that I use to feed the auxiliary antenna input. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Brett Howard
Brett,
I'm using the Aux RF inputn but in looking at the block diagrams it looks like all of the Ant inputs are COR protected. I didn't notice any problems activating the COR, but I'm not near anyone else and I was running QRP as well. My doublet runs N & S about 15' to the right of my operating position (up 35'). I then have the short beverage running E & W starting at my operating position going away from the doublet. Not sure if this helps you or not... 73, Dave W8FGU -----Original Message----- From: "Brett Howard" <[hidden email]> Date: Tue, 14 Jul 2009 09:26:03 To: <[hidden email]>; 'Vic K2VCO'<[hidden email]> Cc: 'Elecraft Reflector'<[hidden email]>; 'Bill Tippett'<[hidden email]> Subject: RE: [Elecraft] K3 Diversity Rocks! Are you gentlemen using the second KAT3 port or are you using the AUX RF path? I tried using the KAT3 port and found that with other stations around my COR's were switching on me when the other station got into us a little bit. Their antenna was as loosely coupled to ours as I could have gotten it in the space we had. There were two windoms both on the same string between trees so they were end to end of one another tip to tip. Then our other antenna was 90 degrees off and when we TXed I found that it would get into the other port and operate the CORs that way as well. Does this possibility go away when you come in through Aux RF? ~Brett -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Dave Van Wallaghen Sent: Tuesday, July 14, 2009 6:39 AM To: Vic K2VCO Cc: Elecraft Reflector; Bill Tippett Subject: Re: [Elecraft] K3 Diversity Rocks! Vic wrote: I also hear the signal moving back and forth with QSB, but there seems to be another advantage as well. One problem I have copying weak CW signals is that sometimes a bit of noise comes along and causes me to miss a letter in a call, for example, and I have to wait for the guy to send it again. During a QSO it's less of a problem because the brain fills in letters and words from the context, but sometimes I am missing almost every other letter and this mechanism breaks down. Possibly the noise is picked up differently by the antennas...I'm not sure, but when diversity is on, the signal seems to stand out, less damaged by the noise. Far fewer letters get crunched -- it makes it much easier to copy. ----------------------- Yes, that is exactly what I heard as well. The sound was much richer and full and the sigs just seemed to pop up out of the noise better. Doing A/B comparisons between diversity and single receive I heard much more ringing in narrow DSP filtering on single receive that combined with the noise would tend to bury some signals. But with diversity reception, the signal would seem to pop out more and sound better with much less ringing or harshness. 73, Dave W8FGU ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Bill W4ZV
Congrats Bill! Think you're too modest, experience counts too ;o)
I had my first golden log 130 QSOs, 66 multipliers all good. K3, no second Rx for this contest, only one short beverage and only 100 watts. Good enough for 8th in the US. I'm sure you noticed the recent IARU 3830 soapbox postings, MANY K3s now used for top scores, and more converts seem to be on the way: http://www.eskimo.com/~mwdink/3830/IARU%20Soapbox%20July%2014%202009.txt Seen more postings on the 4 square Rx arrays, sounds like if you have the room it's the way to go. Still playing with my second Rx, much to learn yet. GL in NAQP RTTY! 73, Julius Your questions in order: 1. My main TX array is similar to a 4-square and my RX antennas are 7 Beverages ranging from 600-1100'. I have my K3 set up so I normally listen on both (i.e. in diversity) but I can also quickly switch between the TX array only or the Beverages only. I also sometimes use an inverted-V for "local" stations in NA/SA instead of the vertical array. 2. Diversity can be very helpful to fight the QSB characteristic on 160. I've sometimes heard signals switching back and forth between ears several times within a second. I believe this allows me to copy calls and exchanges the first time without the need for repeats. It also helps me copy callers from multiple directions simultaneously. 3. My QSO score reduction was from 435 claimed to 428 final which is fairly good (1.6% error rate). Considering how weak signals can be on 160, the unique power exchange is often a challenge to copy correctly. I miscopied 1 call and 6 power exchanges. The comment from OL0W below is not necessarily very scientific but FWIW... "Only for fun, when the band was already closing, I decided to try what I will be able to work with QRP. Using longer callsing OK1DSZ and the power reduced to 5W I spend about 10 minutes calling several east coast big guns. The award for the best ears goes to W4ZV, who was worked as easily as with the kilowatt earlier in the night. K8PO and W2FU were worked with several repeats. The others just kept CQing without any reaction with exception of K1TTT, who apparently heard something, but not enough for the QSO." > A good number of people in EI are purchasing K3s at this time. It not only has about the best performance but offers probably the best value with the opportunity to build up the radio gradually. Shhhh!!! We don't want to publicize our competitive advantage. ;-) Tim KT1D corrected me on K1XM's location...it's actually W1KM where he was one of the ops and it was an all K3 operation. 73, Bill
Julius Fazekas
N2WN Tennessee Contest Group http://www.k4ro.net/tcg/index.html Tennessee QSO Party http://www.tnqp.org/ Elecraft K2 #4455 Elecraft K3/100 #366 Elecraft K3/100 |
Re: K3 Diversity Rocks!
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In reply to this post by Bill W4ZV
Vic K2VCO wrote:
> Possibly the noise is picked up differently by the antennas...I'm not > sure, but when > diversity is on, the signal seems to stand out, less damaged by the noise. > Far fewer > letters get crunched -- it makes it much easier to copy. Space Diversity can work wonders on 6m and 4m with DX signals at or just below the noise floor. 73, Geoff GM4ESD ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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In reply to this post by Vic K2VCO
So if we heard those relays switching then we're dangerously close to
damage occurring? We found that we'd be listening and usually right in the middle of a guy giving his call you'd hear a click and a short bit of muting in the RX... Looks like swapping out for the AUX RF input isn't going to help me in that department. Perhaps I'll get greater isolation between the two receivers in that configuration though. On Tue, Jul 14, 2009 at 10:01 AM, Vic K2VCO<[hidden email]> wrote: > Brett Howard wrote: >> >> Are you gentlemen using the second KAT3 port or are you using the AUX RF >> path? I tried using the KAT3 port and found that with other stations >> around >> my COR's were switching on me when the other station got into us a little >> bit. Their antenna was as loosely coupled to ours as I could have gotten >> it >> in the space we had. There were two windoms both on the same string >> between >> trees so they were end to end of one another tip to tip. Then our other >> antenna was 90 degrees off and when we TXed I found that it would get into >> the other port and operate the CORs that way as well. >> Does this possibility go away when you come in through Aux RF? > > I'm using AUX RF. It has a COR too. I suffered a malfunction in this area > which I really do not fully understand and the COR relay was damaged. After > replacing the relay and making a few updates to my (beta test version) KRX3 > that were recommended by Elecraft support, I am still a little nervous. So I > added back-to-back diodes across the switch that I use to feed the auxiliary > antenna input. > > -- > 73, > Vic, K2VCO > Fresno CA > http://www.qsl.net/k2vco > Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Brett Howard wrote:
> So if we heard those relays switching then we're dangerously close to > damage occurring? We found that we'd be listening and usually right > in the middle of a guy giving his call you'd hear a click and a short > bit of muting in the RX... Looks like swapping out for the AUX RF > input isn't going to help me in that department. Perhaps I'll get > greater isolation between the two receivers in that configuration > though. I don't really know what caused my problem. So I am saving my speculations for the next time I feel I can take up Wayne's time. I do know that replacing the relay was a minor pain in the butt and I don't want to take any more chances. -- 73, Vic, K2VCO Fresno CA http://www.qsl.net/k2vco ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Don't forget the I.C.E #196 product. This has stopped my COR activity, and also isolates my MFJ-1026 noise antenna. And this is with the main antenna starting at the tuner in the shack, and the 2nd receive antenna a floor to ceiling vertical wire right next to the operating desk.
Wayne WA9VEE
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In reply to this post by Doug Turnbull
On 13 jul 2009, at 21.42, EI2CN Doug Turnbull wrote:
> Just how much of an improvement do you find with diversity > reception? Is it possible to quantize? I have a second receiver > on order > at this very moment and am looking forward to a new season on top > band. > Sadly I was on twenty for the ARRL test this year. I think you will be impressed with the diversity performance of the K3, to me it was well worth the investment. Just using my available antennas being very close to each other I have noticed a big different receiving DX signals with QSB on 160 meter. Here is a recording of 4X4DK calling using diversity. Every time the signals tilts over to one side, the signal has dropped out of the other which proves that two antennas are better than one. Another thing worth notning is that the static discharges you hear in the beginning of the call is stronger in antenna than the other, so not only wanted signals are improved but diversity can also help fighting QRN depending on its nature. Recording: http://sm0mdg.com/audio/4X4DK-div.mp3 If I remember correct, the left channel is an East pointing pennant and the right channel is a 20 ft coax loop. I wish I hade more recordings at hand, but I am sure others have and can chime in. 73 de Björn, SM0MDG SE0X ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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Nice recording Bjorn! I've often heard signals switching just as you recorded but don't have a recorder hooked up on my shack computer. I'm just curious how your AGC was set (Fast or Slow)? It sounded like a slow recovery to the lightning crash near the beginning. 73, Bill |
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On 19 jul 2009, at 01.56, Bill W4ZV wrote:
>> >> Recording: http://sm0mdg.com/audio/4X4DK-div.mp3 >> > > Nice recording Bjorn! I've often heard signals switching just as you > recorded but don't have a recorder hooked up on my shack computer. > > I'm just curious how your AGC was set (Fast or Slow)? It sounded > like a > slow recovery to the lightning crash near the beginning. Bill, To be honest I don't remember the AGC S/F setting when recording this, it is some time ago. I trust your judgement on slow AGC. What I do know is that the config menu settings for AGC would have been default at that time. But this might be a good season to play with AGC settings as static is high at the moment. 73 de Björn, SM0MDG SE0X ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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