Re: Lisagram & "In stock by June" - really?
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I should add that the performance of the radios/ops of the
VP6DX operation will increase the interest/orders for the K3. Last night I worked VP6DX on 30m cw at 10113 and 30m RTTY at 10140 both on the band at the same time. Clearly no QRM problems! Doug W6JD -------------- Original message -------------- From: "DOUGLAS ZWIEBEL" <[hidden email]> > It is my forecast that delivery times will not be improved for > long...quite the opposite. > > Once the "rest of the ham world" gets wind of the Sherwood (and > presumably closely matching ARRL) data, the K3 orders will go through > the roof (no pun intended). > > I would expect orders to start showing up on an order of magnitude of > 10 or more "real soon" after this information hits the streets and is > "confirmed" by famous Contesters and DXers...some of whom are taking > delivery now. It won't take long for DX and Contest Clubs to > disseminate this information to their membership. > > I would also expect the K3 base price to go up too (in other > words...if you're still sitting on the fence, put it gear NOW). > > Sure hope the Aptos guys have a strong contingency plan for the deluge. > > de Doug KR2Q > > PS. Glad I got my 2nd one ordered this past November!!! Especially > glad since I have played with #295 this past weekend. Can't get > enough! > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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My factory bilt K3 , just out of the box, desensed nearly to zero rcve with 1KW xmit on different band w. ant. 70 feet away. I want to know what filtering the VP6 guys are doing IN ADDITION to turning on their K3s. 73Charles [hidden email] > From: [hidden email]> To: [hidden email]> Subject: Re: [Elecraft] Lisagram & "In stock by June" - really?> Date: Tue, 19 Feb 2008 20:03:05 +0000> > I should add that the performance of the radios/ops of the> VP6DX operation will increase the interest/orders for the> K3. Last night I worked VP6DX on 30m cw at 10113> and 30m RTTY at 10140 both on the band at the same> time. Clearly no QRM problems!> > Doug> W6JD> > -------------- Original message -------------- > From: "DOUGLAS ZWIEBEL" <[hidden email]> > > > It is my forecast that delivery times will not be improved for > > long...quite the opposite. > > > > Once the "rest of the ham world" gets wind of the Sherwood (and > > presumably closely matching ARRL) data, the K3 orders will go through > > the roof (no pun intended). > > > > I would expect orders to start showing up on an order of magnitude of > > 10 or more "real soon" after this information hits the streets and is > > "confirmed" by famous Contesters and DXers...some of whom are taking > > delivery now. It won't take long for DX and Contest Clubs to > > disseminate this information to their membership. > > > > I would also expect the K3 base price to go up too (in other > > words...if you're still sitting on the fence, put it gear NOW). > > > > Sure hope the Aptos guys have a strong contingency plan for the deluge. > > > > de Doug KR2Q > > > > PS. Glad I got my 2nd one ordered this past November!!! Especially > > glad since I have played with #295 this past weekend. Can't get > > enough! > > _______________________________________________ > > Elecraft mailing list > > Post to: [hidden email] > > You must be a subscriber to post to the list. > > Subscriber Info (Addr. Change, sub, unsub etc.): > > http://mailman.qth.net/mailman/listinfo/elecraft > > > > Help: http://mailman.qth.net/subscribers.htm > > Elecraft web page: http://www.elecraft.com > _______________________________________________> Elecraft mailing list> Post to: [hidden email]> You must be a subscriber to post to the list.> Subscriber Info (Addr. Change, sub, unsub etc.):> http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm> Elecraft web page: http://www.elecraft.com_______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Hi Charles,
at our contest QTH we have low loss band pass filters between the transceiver and the PA <http://www.bavarian-contest-club.de/projects/bandpassfilter/100W-BP.pdf> (in German). These filters protect the the receivers on other bands, e.g. we have a multi-band beam and a 40m beam close together on the same tower, and when transmitting on one of the antennas several watts come back on the other antenna. Also they cut down the wide band phase noise. 4O3A uses filters at the kW level to do the same. When I was in Montenegro at Ranko's station, he had the prototypes in test and they worked surprisingly well. <http://www.yt6a.com/en/hi-power-filters/high-power-band-pass-hf-filters.html>. > desensed nearly to zero I do not know if this has been implemented yet, but Wayne was planning on watching the return power during reception, so that he could protect the front end of the K3. Maybe this could be part of what you are observing. vy 73 de toby _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Charly
On Wed, 2008-02-20 at 10:19 +0000, Charles Harpole wrote: > My factory bilt K3 , just out of the box, desensed nearly to zero rcve > with 1KW xmit on different band w. ant. 70 feet away. 70 feet is a tiny spacing in wave-length terms, depending on the antennas you could have several 10's of watts arriving at the K3 in this scenario. Before trying to operate multiple radios and multiple antennas you need first to evaluate how much interaction you have between ALL the various combinations. Then you need to take whatever steps are required to keep RF arriving at the other radios in damage inducing amounts. I am no expert multi-multi setups but I would be inclined to keep below 0.1w returned into 50 Ohms Another factor is wide-band phase noise on TX and amp generated noise. PA stages in radios and amplifiers tend to use high pass filters to reduce harmonic content, these will do little to clean up 'crud' below the TX frequency Be very careful in multi-TX setups you need to be careful about how you engineer things or you risk rig damage. If this is just for casual operating, adding interlocks to your band switching so that you can't inadvertently select combinations that are potentially risky might be a good idea > I want to know what filtering the VP6 guys are doing IN ADDITION to > turning on their K3s. 73Charles Lots of separation between stations on the same band, use of separate RX antennas separated by distance and polarisation, clean amps and probably a bunch of high quality band-pass filters too. 73 Brendan EI6IZ -- Don‘t complain. Nobody will understand. Or care. And certainly don‘t try to fix the situation yourself. It‘s dangerous. Leave it to a highly untrained, unqualified, expendable professional. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Charly
A cheap and effective thing some use is coax stubs. Stubs can be cascaded. They can be made switchable just like bandpass filters.
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In reply to this post by Charly
At G6M I fitted BP filters between the t/rx and the linear and coax stub filters on the linear outputs. Made things much quieter for the station in the same room using antennas in the same field. Direct harmonics are now only S9 not S9++++ and no phase noise to speak of.
David G3UNA > > From: [hidden email] > Date: 2008/02/20 Wed AM 10:36:51 GMT > To: Charles Harpole <[hidden email]> > CC: [hidden email] > Subject: Re: [Elecraft] other xmitter nearby > > Hi Charles, > > at our contest QTH we have low loss band pass filters between the > transceiver and the PA > <http://www.bavarian-contest-club.de/projects/bandpassfilter/100W-BP.pdf> (in > German). > > These filters protect the the receivers on other bands, e.g. we have a > multi-band beam and a 40m beam close together on the same tower, and > when transmitting on one of the antennas several watts come back on > the other antenna. Also they cut down the wide band phase noise. > > 4O3A uses filters at the kW level to do the same. When I was in > Montenegro at Ranko's station, he had the prototypes in test and they > worked surprisingly well. > <http://www.yt6a.com/en/hi-power-filters/high-power-band-pass-hf-filters.html>. > > > > desensed nearly to zero > > I do not know if this has been implemented yet, but Wayne was planning > on watching the return power during reception, so that he could > protect the front end of the K3. Maybe this could be part of what you > are observing. > > vy 73 de toby > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > ----------------------------------------- Email sent from www.virginmedia.com/email Virus-checked using McAfee(R) Software and scanned for spam _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Charly
On Wed, 2008-02-20 at 02:19, Charles Harpole wrote:
> My factory bilt K3 , just out of the box, desensed nearly to > zero rcve with 1KW xmit on different band w. ant. 70 feet away. > I want to know what filtering the VP6 guys are doing > IN ADDITION to turning on their K3s. > 73Charles [hidden email] If you don't mind winding toroids, a set of switchable bandpass filters should do the trick: "Inexpensive Interference Filters" Alan Bloom N1AL QST, June 1994, pp 32-36 These filters each cover an entire amateur band, so don't help with phone/CW stations on the same band. For Field Day, the local club would locate all the CW stations at one end of the site and all the SSB at the other end, and then use these filters on each station. Al N1AL _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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