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Re: [CQ-Contest] two radios on same band (10m contest)

To: "<cq-contest@contesting.com>" <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] two radios on same band (10m contest)
From: David Siddall <hhamwv@gmail.com>
Date: Thu, 28 Nov 2013 13:27:18 -0500
List-post: <cq-contest@contesting.com">mailto:cq-contest@contesting.com>
Do I remember correctly that there was terrain blockage also -- the lower 
antenna was down a mountain slope?  And that you did this on 10 & 20, as well 
as 15?  

Dave K3ZJ (then-op. @ W3AU listening to you from the east coast)


On Nov 28, 2013, at 12:12 PM, "Rex Maner" <k7qq@netzero.net> wrote:

> In the early 70's  K7JA and myself W5QQQ operated at W7RM, we started on 15 
> ssb working JA's and the Caribbean, Chip was running well over 200 Q's per 
> hour and I was S & P . 
> 
> At this particular time there was no restriction on how many signals could be 
> on the band at the same time. 
> 
> We were both running Collins S-Line and KW's.
> 
> The antennas had aprox 250 foot of vertical separation . The lower antenna 
> was about 70 ft above saltwater beaming to Asia and antenna # 2 was at 170 
> foot beaming east.  
> 
> We were able to, with ease operate within 15Khz and not even know the other 
> station was on the band. We had no filters .
> 
> Rex K7QQ
> 
> 
> -----Original Message-----
> From: CQ-Contest [mailto:cq-contest-bounces@contesting.com] On Behalf Of 
> Kevin McGrath
> Sent: Thursday, November 28, 2013 2:55 AM
> To: cq-contest@contesting.com
> Subject: [CQ-Contest] two radios on same band (10m contest)
> 
> I would like to get some advice on running two radios on the
> *same* band, specifically for 10 meters.There’s plenty of good information 
> here and on the web regarding minimizing interference when running multiple 
> radios on different bands, but not much info at all on the same band.
> 
> The plan is to enter the ARRL10m contest, multi-op, mixed SSB/CW, low-power 
> (<150 watt) category and use a run radio and a multiplier radio (only one 
> transmitter at a time).  To help minimize interference, one radio would be on 
> CW portion (say below 28.050) and the other on SSB (above 28.400) and thus 
> maintain at least a 350-400kHz frequency separation. Also the antennas for 
> each radio will be different polarizations. But given space limitations at 
> the QTH, the antennas can only be separated by 100’.   Are commercial 
> bandpass filters or homebrew designs available for in-band use? 
> 
> 
> I’m guessing two
> radios have been successfully used for the 10m contest. Any ideas or tips on 
> the setup for minimizing inter-station interference would be greatly 
> appreciated.
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