How are you going to connect the acc jack wires from one rig to two
amplifiers without switching? Can you just use a Y connection? Are you using
key line interface units between rig and amp? BTW, I find that drawing a
system block diagram with all the cables and ports shown (rig, amp, swr
meter, tuner, power supplies, computer) helps to keep things clear as to
what connects to where. Then keep the drawing up to date so when you want to
make changes it is easy to see what you have and what you need to change.
Ron W8RJL
----- Original Message -----
From: "Al Kozakiewicz" <akozak@hourglass.com>
To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Sent: Tuesday, May 14, 2013 10:44 PM
Subject: Re: [TowerTalk] Transfer switch?
Thanks for the suggestions. The obvious one - use the xceivers two
antenna outputs to switch between amps - eluded me until I started doing
some of the hookups. Kind of a duh moment. A garden variety SPDT will
work just fine for the antenna system.
The solid state amp uses band and keying info from the transceivers acc
jack, so I did not need to worry about switching the keying line.
Al
AB2ZY
________________________________________
From: Ron W8RJL [youngron@verizon.net]
Sent: Tuesday, May 14, 2013 9:38 PM
To: Tower and HF antenna construction topics.
Cc: Al Kozakiewicz
Subject: Re: [TowerTalk] Transfer switch?
Why not use two Dow Key type relays each SPST. They come in several DC
voltages and 115 VAC. They will handle the 1500 watts, have low SWR, all
you
need is power source and a SPDT toggle switch. Dow key type relays sell
for
about $30 used last I looked, kind of old school but will sure do the job.
You would probably want to parallel up another signal relay to switch ALC
and key line as well so relays look like a good solution. 73 Ron W8RJL
----- Original Message -----
From: "Al Kozakiewicz" <akozak@hourglass.com>
To: <towertalk@contesting.com>
Sent: Tuesday, May 14, 2013 9:25 PM
Subject: [TowerTalk] Transfer switch?
Does anyone know of a source for a reasonably priced manual RF transfer
switch, i.e. DPDT with either UHF or N connectors? Reasonable = < $100.
Needs to handle 1500 watts @ HF.
I want to switch 2 amplifiers (solid state & tube) between 1 radio and 1
antenna system. Yes, I can use 2 SPDT switches, and will do if a DPDT is
not readily available. Google turns up a lot of relays that seem
designed
for microwave use and broadcast quality items with one too many zeros in
the price.
Al
AB2ZY
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