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[Amps] Input relay for QSK amp

To: <>
Subject: [Amps] Input relay for QSK amp
From: "Jim Thomson" <>
Date: Sun, 9 Dec 2018 11:54:03 -0800
List-post: <>
Date: Sun, 9 Dec 2018 08:22:45 -0700
From: Jim Garland <>
To: Bob Maser <>,
Subject: Re: [Amps] Input relay for QSK amp

<Jim, You're right in principle, of course. The problem is that a 
<well-designed amplifier relay circuit shouldn't depend on what 
<transceiver is used. The amplifier itself should be immune to 
<hot-switching in all situations.

<Jim W8ZR

##  Ok, what happens on VOX  SSB ??   Some xcvrs output  RF
a lot faster than  others.   And the  0-30 msecs  delay adjustment on my
yaesu  FT-1000-MP  MK-V  only works on CW  mode. 

##  One fellow on another forum mentioned that his  new yaesu  FTDX-3000 
when run on VOX  SSB, has a tendency  to  fry the relay contacts on his  L4B
and L7 amps, which are  3PDT mech types, with  15 msec operate time.  His
conclusion is the 3000  xcvr outputs RF on ssb  vox, a lot quicker than any of 
other xcvrs.   The only  fix is faster TR relays in the amps  with  3 pdt  

Jim   VE7RF

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