[CQ-Contest] Multi 2 locking device?

Igor Sokolov ua9cdc at gmail.com
Sat Jan 7 06:19:00 EST 2017

1) Two LP on different bands with different antennas - use 
http://microham.com/contents/en-us/d75.html or 
http://quad.ru/production/switchSO2R.php The latter has better port 
isolation. WX0B six pack has much poorer port isolation then the above 
mentioned two switches). For home brew switch project try here 
http://www.sj2w.se/contest/?page_id=1547  and here 

2) Two LP on different bands using the same multiband antenna - in addition 
to the abobe switch you will need triplexer and band pass  filters. The best 
combo one is by VA6AM (ex UN7LG) 
There are also W2NQN filters (good), UA4CC filters 
http://quad.ru/production/bpf.php (very good), RA6LBS triplexer 
http://quad.ru/production/bpf.php, There are also INRAD and DUNESTAR 
triplexers but VA6AM seems to be the best (see here 
VA6AM has got all the info for building home brew triplexer and filters.
5B5AGN has the info for building BPF here 
Also a lot of (but not complete) info can be found here 

73, Igor UA9CDC
----- Исходное сообщение ----- 
От: <john at kk9a.com>
Кому: <cq-contest at contesting.com>
Отправлено: 6 января 2017 г. 21:27
Тема: Re: [CQ-Contest] Multi 2 locking device?

> One somewhat expensive solution is to use a triplexer and then feed each
> bands coax into a 2x6 relay box such as a SixPak. The relay box makes it
> physically impossible for both radios to connect on the same band. The
> triplexer will allow you to operate on two bands simultaneously with using
> the Cushcraft beam using band pass filters.
> John KK9A
> To: cq-contest <cq-contest at contesting.com>
> Subject: [CQ-Contest] Multi 2 locking device?
> From: "Fco. Luis Delgadillo" <xe2b at outlook.com>
> Date: Thu, 5 Jan 2017 18:03:29 +0000
> Hola,
> I'm planning to operate M2 LP, the oncoming contest season.
> I do have two WX0B passbands filters from my previous SO2R setup.
> -Only two radios will be used.
> and
> - Very simple antennas setup on a city lot:
> Log periodic Cushcraft ASL-2020
> Vertical tribander Force13 VR-3
> Twin Slopper Alpha-delta DX-A
> Is there any summary related to options available for locking devices to
> prevent two radios to operate in the same band?  I do not want to have 
> burned
> front ends.
> Preferably,  I would like to build it.
> I appreciate the feedback
> 73
> Luis XE2B
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