Diversity and CW?
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Does CW benefit from diversity reception? Can anyone relate any
experiences with such improvement and some details on their setup including filters/settings? 73 jim ab3cv ______________________________________________________________ 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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It benefits as much as any other mode. The most important thing and the most difficult thing is installing two complementary antennas. You hear the signal from one antenna and receiver in the left ear and the other in the right ear. You benefit when you have a weak signal that is sometimes better on one antenna than the other. Your other settings should ordinarily be the same for both receivers with what ever other settings work best for you.
Willis 'Cookie' Cooke K5EWJ ________________________________ From: Jim Miller <[hidden email]> To: Elecraft Reflector <[hidden email]> Sent: Mon, December 28, 2009 7:44:50 PM Subject: [Elecraft] [K3] Diversity and CW? Does CW benefit from diversity reception? Can anyone relate any experiences with such improvement and some details on their setup including filters/settings? 73 jim ab3cv ______________________________________________________________ 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 Jim AB3CV
> Does CW benefit from diversity reception? Can anyone relate any
> experiences with such improvement and some details on their setup > including filters/settings? Absolutely Jim! Diversity helps on ALL MODES. The main thing I notice is that it "fills in the dips", in other words when a signal fades in QSB on the main antenna, it seems to not dip as far and may even come up a little on the diversity receiver. The net effect is that the signal appears to drifts side-to-side from ear-to-ear rather than up-and-down into the noise. I estimate diversity is worth a few very valuable dB on receive. It helps most with those weak, QSB-ridden DX signals wandering up and down at the band noise level. Nothing special needed on the filters & settings - just turn diversity on - with one exception: for best performance, the main and diversity RXs need matched filters. Mismatch will apparently cause a slow 'beat' and reduce the benefit. The more important issue is to have sufficiently different antennas for main RX and diversity RX, ideally with both spatial and polarization diversity. I have been using my normal TX antennas for the main RX, all about 100m from the shack on a remote switch, and a single 30m wire loop for diversity RX, about 10m from the shack in the opposite direction. The 30m loop works best on 30m, of course, but helps to some extent on all other bands except 20m where it's too badly mismatched. A full set of monoband diversity RX antennas would be lovely, and I guess a decent multiband vertical would work OK too, but meanwhile the 30m loop does the job ... Or rather it did until a storm broke the line, and I put up a 12m TX loop instead! I miss diversity and plan to reinstate the 30m loop, moving the 12m loop across to the TX end. 73 Gary ZL2iFB ______________________________________________________________ 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 Jim AB3CV
Jim, listen to some of the recordings at http://n1eu.com/K3/diversity.htm By switching between stereo listening and mono listening to a single channel, you can get a good idea of the difference between diversity and non-diversity reception on some weaker signals. 73, Barry N1EU |
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In reply to this post by Gary Hinson
On Tue, 29 Dec 2009 17:20:53 +1300, "Gary Hinson" <[hidden email]>
wrote: >> Does CW benefit from diversity reception? Can anyone relate any >> experiences with such improvement and some details on their setup >> including filters/settings? > >Absolutely Jim! Gary, I have a 30m GP here with 3 radials at ten feet. I use that antenna for TX on 30m. For RX I use a one wavelength (about 98 feet) beverage with the terminated end toward Europe. Working EU using the beverage works pretty good even though it is short. It has less noise than the GP and when using diversity RX it is helpful and I find that it works on other bands too... It sounds like you have the space for a longer beverage on 30m. DX Engineering http://www.dxengineering.com/Sections.asp?ID=32&DeptID=12#Top has some hardware to make beverage construction simpler. You might take a look at beverages. They are also described in the ARRL Antenna books. 73, Tom, N5GE [hidden email] K3 #806 with SUB RX, K3 #1055, PR6, XV144, XV432, KRC2, W1, 2 W2's and other small kits 1 K144XV on order http://www.n5ge.com http://www.swotrc.net >The more important issue is to have sufficiently different antennas for main RX and diversity RX, >ideally with both spatial and polarization diversity. I have been using my normal TX antennas for >the main RX, all about 100m from the shack on a remote switch, and a single 30m wire loop for >diversity RX, about 10m from the shack in the opposite direction. The 30m loop works best on 30m, >of course, but helps to some extent on all other bands except 20m where it's too badly mismatched. >A full set of monoband diversity RX antennas would be lovely, and I guess a decent multiband >vertical would work OK too, but meanwhile the 30m loop does the job ... Or rather it did until a >storm broke the line, and I put up a 12m TX loop instead! I miss diversity and plan to reinstate >the 30m loop, moving the 12m loop across to the TX end. > >73 >Gary ZL2iFB > >______________________________________________________________ >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
Amateur Radio Operator N5GE
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In reply to this post by Jim AB3CV
Hi Jim:
If you're on the fence as to whether or not you should buy a sub-receiver I would answer as follows. If the "only" reason for your buying a sub RX is to obtain diversity reception I would suggest that you first purchase the KXV3A option which gives you the ability to use a separate receive antenna on your main receiver. (You would want this option even if you purchased the sub RX). Once you have the KXV3A you could see just how good your receive antenna really is. If it frequently pulls in signals that you have trouble hearing with your transmit antenna then it would probably be pretty good as a diversity antenna in any mode. If it doesn't, then you just saved yourself the cost of a sub RX and its filters. 73, Mike K2MK from Jim AB3CV Does CW benefit from diversity reception? Can anyone relate any experiences with such improvement and some details on their setup including filters/settings? 73 jim ab3cv |
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Hi All
Thanks for all the diversity input. I was just interested in how it affected CW. Sounds like if I can swing receive antenna that won't get clobbered by my current antenna when transmitting it might be worth pursuing. FWIW, Santa brought me a subRX which for now will be used to listen to splits. I plan to wire it up to be able to use ANT1 and AUX-RF when I install it. 73 jim ab3cv ______________________________________________________________ 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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I purchased my sub-receiver for one specific use ... to monitor
6M for band openings while the radio might tuned to another band. I used the Elecraft-supplied BNC(F) to TMP(M) cable to feed the sub-receiver's input. This arrangement is essentially "permanent" unless one does a partial dis-assembly to gain access the sub-receiver's input jack. I later decided that I'd like more flexibility regarding the choice of antenna for the sub-receiver. I now route the cable from the BNC(F) to the area atop the sub-receiver and secure it to the knurled nut on the top of the sub-receiver. I also routed the cable from the antenna tuner to the same area and secured it along with the end of the cable from the rear panel BNC(F). Next I made up a short (6") TMP(M) to TMP(F) cable that plugs -permanently- into the sub-receiver's input. This short cable is also routed to the same area as the ends of the other two cables. Now, by lifting the top cover of the rig, I can choose which source is fed to the sub-receiver's input via the short extension cable. It's -much- easier to gain access to the sub-receiver's antenna jack if the KI03 is removed. It's easy to damage the input jack on the sub-receiver if you try to plug a cable into the jack from above. 73! Ken Kopp - K0PP [hidden email] http://tinyurl.com/7lm3m5 ______________________________________________________________ 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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I'm thinking of a relay at that point to switch between them. But
then I guess there goes your isolation afforded by the BNC. Would a Y cable affect the input Z enough to affect the gain? Stan Rife W5EWA -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Ken Kopp Sent: Tuesday, December 29, 2009 3:05 PM Cc: [hidden email] Subject: [Elecraft] K3 Sub Rx antenna input choices I purchased my sub-receiver for one specific use ... to monitor 6M for band openings while the radio might tuned to another band. I used the Elecraft-supplied BNC(F) to TMP(M) cable to feed the sub-receiver's input. This arrangement is essentially "permanent" unless one does a partial dis-assembly to gain access the sub-receiver's input jack. I later decided that I'd like more flexibility regarding the choice of antenna for the sub-receiver. I now route the cable from the BNC(F) to the area atop the sub-receiver and secure it to the knurled nut on the top of the sub-receiver. I also routed the cable from the antenna tuner to the same area and secured it along with the end of the cable from the rear panel BNC(F). Next I made up a short (6") TMP(M) to TMP(F) cable that plugs -permanently- into the sub-receiver's input. This short cable is also routed to the same area as the ends of the other two cables. Now, by lifting the top cover of the rig, I can choose which source is fed to the sub-receiver's input via the short extension cable. It's -much- easier to gain access to the sub-receiver's antenna jack if the KI03 is removed. It's easy to damage the input jack on the sub-receiver if you try to plug a cable into the jack from above. 73! Ken Kopp - K0PP [hidden email] http://tinyurl.com/7lm3m5 ______________________________________________________________ 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 Jim AB3CV
My receive antenna for the 2nd receiver is a floor to ceiling wire I have
stuck to an indoor wall corner and tuned for the band of operation with a small MFJ tuner. Many times it pulls in signals better than my main outside long wire.Those times when it isn't better but still receives the station, the additive result is always better than one receiver alone. I would never not want Diversity enabled unless the 2nd antenna just doesn't hear the station. For those few times I just tap SUB and go with the main receiver. 99% CW here. Wayne WA9VEE ______________________________________________________________ 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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