[Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys)

[Mark Robinson]

I would key the amp by grounding the amp PTT line. I would measure the 
keying current and also the amp ptt open circuit voltage and then check the 
spec on the FT1000D. Then you would know if the FT1000D can key the amp 
without damage.

An unmodified TL922 will have around 120VDC on the open circuit relay PTT 
line and this voltage can damage some transceivers.


Mark N1UK

----- Original Message ----- 
From: "Behiels JeanPierre" <on4aef at telenet.be>
To: <amps at contesting.com>
Sent: Friday, 18 October, 2013 5:14 PM
Subject: [Amps] Keying Kenwood TL922 with Yaesu FT1000D (both old guys)


> Hi guys;
>
> Anyone could me put in the right way for next coming contest.
> Witch connection plug I best use on the back of the FT1000D for keying 
> this old TL922.
> I saw that the Tl922 keying system has been modified so it could be keyed 
> by means of a low power transistor.
> The keynig system of the FT1000D could not be damage by this setup !
> I useual do not handle with amplifiers in my ham carreer so poor 
> expirience around hi..
>
> Kindly regards and thanks to all I look forward
>
> Jean ON4AEF.
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