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

[Barry]

On 11/28/2013 11:43, Barry wrote:
> You'll get the best isolation if one antenna is horizontally polarized 
> and the other is vertically polarized.
> Barry w2UP
>
> On 11/28/2013 11:27, David Siddall wrote:
>
>>> 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 at 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 at contesting.com] On 
>>>> Behalf Of Kevin McGrath
>>>> Sent: Thursday, November 28, 2013 2:55 AM
>>>> To: cq-contest at 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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>