[Kenwood] Amplifier Keying from various transceivers

[AD5PE]

Even reading the schematic may not always be enough.  With the short parts
pipelines and rapid changes in technology7, parts may be substituted on a
regular and frequent basis.  There is usually a similarity in specs, but in
some cases either price or "close enough" may result in even the schematic
being wrong - at least slightly....

However, the MANUAL(s) (radio and amp) should say what is required (amp
side) or can be safely handled (radio side).  For sure you don't want to try
to switch an amp with a 110v relay with a radio keying circuit designed for
12V @ 200ma.

Jay

-----Original Message-----
From: kenwood-bounces at mailman.qth.net
[mailto:kenwood-bounces at mailman.qth.net] On Behalf Of rbethman
Sent: Sunday, February 10, 2013 12:57
To: kenwood at mailman.qth.net
Subject: Re: [Kenwood] Amplifier Keying from various transceivers

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

______________________________________________________________
Kenwood mailing list
Home: http://mailman.qth.net/mailman/listinfo/kenwood
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Kenwood at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html