Bill,
Your "logic box" is called a sequencer, Does exactly as you describe. Most
commonly used for EME or with transceivers and amplifiers. Readily
available from many sources.
73, Roger
W7TZ
CN83ia
Grid Busters
w7tz.webs.com
On Thu, Oct 5, 2017 at 11:47 PM, David Harmon <k6xyz@sbcglobal.net> wrote:
> Array Solutions made a 'bias switching' box that essentially has the amp
> antenna relay keyed all the time and the bias was switched.
> I know of a guy that had one installed in his Henry 3K-A and I was
> considering installing one in my 3K-A but I never followed through with it.
> This was 4 or 5 years ago and I don't recall exactly how it worked just now
> but as I remember....it was pretty slick.
>
>
> 73
>
> David Harmon
> K6XYZ
> Sperry, OK
>
>
> -----Original Message-----
> From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Bill Turner
> Sent: Thursday, October 5, 2017 10:53 PM
> To: Amps group <amps@contesting.com>
> Subject: Re: [Amps] Amplifier lifetime
>
> One thing a person can do to extend relay lifetime is to verify there is no
> hot switching going on. Many modern rigs have a built in delay between amp
> keying and actual RF output, but many older rig s do not.
>
> A dual trace scope with one input on the keying line and another on the RF
> output will give the answer. A typical relay takes about 20 mS to switch so
> any delay less than that may be trouble. Remember there are two relays
> which
> have to switch - one in the transceiver and one in the amp. Be sure to
> check
> both key down and key up times.
>
> One method I have heard of but never used myself is to key the amplifier
> first and then have the amp key the transceiver. Simple enough on key down
> but key up is a little more complicated. You need some kind of logic box to
> unkey the transceiver first and then unkey the amp, just the reverse of key
> down. Perhaps such boxes are available on the market? I haven't ever seen
> one.
>
> 73, Bill W6WRT
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