The main amp is an AL-1500 that I don't want to wait to warm up for the casual
15 minute stint in the shack to see what's on the air. It's keyed by a
conventional RCA jack reed relay connection on the transceiver. The solid
state amp - an AL-600 - is controlled through an ARI-501 that keys the amp via
a TTL level signal from the ACC jack. It's a Y in functionality though not in
electrical fact.
Al
AB2ZY
________________________________________
From: Ron W8RJL [youngron@verizon.net]
Sent: Wednesday, May 15, 2013 12:56 AM
To: Tower and HF antenna construction topics.
Cc: Al Kozakiewicz
Subject: Re: [TowerTalk] Transfer switch?
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
>> _______________________________________________
>>
>>
>>
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
> _______________________________________________
>
>
>
> _______________________________________________
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