[Kenwood] Amplifier Keying from various transceivers

[w3bj at juno.com]

I asked the question simply because I aquired a TS 830 and I have newer amps as well as older Heathkit amps. Some of the newer radios required a buffer for keying the older amps as the voltage was different. A lot of hams use footswitch to key amps. I thank everyone for input. I got some great responses. This is why the reflector is here.

---------- Original Message ----------
From: rbethman <rbethman at comcast.net>
To: kenwood at mailman.qth.net
Subject: Re: [Kenwood] Amplifier Keying from various transceivers
Date: Sun, 10 Feb 2013 13:57:07 -0500

Personally, I have NO idea why it was asked.  Then again, not all have 
archives of these pieces of equipment.

Schematic "may" or "may not" indicate what the relay methodology really is.

Looking at current state of Amateur radio, not even sure that "some" can 
even read the schematic.  It isn't any requirement of current 
licensing.  Therefore, asking questions is how one can get information.

Reading the schematic in and of itself will not explicitly state what 
the transceiver can or cannot key.  Takes MORE investigation.  *I* never 
stated that tube final radios are or aren't capable of pulling a hundred 
or so volts to ground.

Bob - N0DGN

On 2/10/2013 1:31 PM, Ken Brown wrote:
> To say that it is safe to key an amplifier, that requires pulling a 
> hundred or so volts to ground, with a specific transceiver, because 
> you have checked the schematic and determined that the keying output 
> of the transceiver is simply relay contacts, is reasonable.
>
> To say that it is safe to key an amplifier, that requires pulling a 
> hundred or so volts to ground, with any transceiver that uses tubes in 
> the final, is not reasonable.
>
> Why someone would ask for those details on an email reflector, instead 
> of looking at the schematic of their transceiver to figure it out 
> themselves, is a mystery to me.
>
> DE N6KB

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