Transverters rather than transceivers.
73, Roger
W7TZ
CN83ia
Grid Busters
w7tz.webs.com
On Fri, Oct 6, 2017 at 3:47 AM, Roger <ai7rogerroger@gmail.com> wrote:
> 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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>
>
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