[TowerTalk] Skinny QRO coax jumpers for station interconnection

[David Robbins]

I faced that same problem of wanting to support the whole range of contest
operation modes.  My solution was to take the existing 6 separate bands and
provide one switch on each one to send the antennas to an SO2R position (I
chose my 40m one because it was kind of centrally located).  Add a 6-pak
there and feed 2 radios.  Use green heron stuff to control rotors and
switches over Ethernet.  Then for s/o turn off the right radio, so2r is
normal setup, any multi-op where you can transmit on more than one band at a
time I flip the switches back to the 6 station setup and only use however
many are allowed for the entry class... things like multiplier bells with
'1' and '2' for m/2 operations help.  This greatly limits the complexity as
not every radio needs access to all antennas.  It gets a bit more complex
when you have multiple receive antennas that are also shared.  More info is
on my web pages, look at the still relatively crude schematics at:
http://wiki.k1ttt.net/Schematics.ashx


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Jim
Smith
Sent: Friday, March 23, 2018 06:33
To: towertalk
Subject: Re: [TowerTalk] Skinny QRO coax jumpers for station interconnection

WOW Tnx very much for all the useful info. And, yes, all these jumpers and
switches will be between the amp and antenna and so will need to be able to
handle QRO. 

I want to be able to configure my modest station for SO, SO2R, M/S and M/2
without having to be forever moving coax around. Looks like 4O3A has a
solution for this but it requires quite a few coax switches and attendant
jumpers. I thought it would be nice to not have to wrestle with relatively
stiff 0.4" coax. However my first foray into pricing RG 400 revealed $5/ft
(7.50 CAD/ft) which made me think RG 213 might not be so bad to wrestle with
after all. However, lots of good info on sources and even kk9a's reference
to 50 ft for $100 on e-bay has rekindled my interest. The comments re the
need for good shielding were also very informative. 

Thanks again everybody 

73, Jim VE7FO 


From: "jim smith" <jimsmith at shaw.ca> 
To: "towertalk" <towertalk at contesting.com> 
Sent: Wednesday, March 14, 2018 9:44:01 PM 
Subject: Skinny QRO coax jumpers for station interconnection 

I have a number of filters and switches to wire up in my QRO station. I
would like the necessary coax jumpers to be thinner (0.25" ?) and more
flexible than, say, RG 213. They will be terminated by crimped PL 259s (or
equivalent). 

Any suggestions as to what I should use? 

73, Jim VE7FO 

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