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

[Jim W7RY]

The TL-922 has 120 volts DC on the relay key line. And yes, it will weld 
the contacts shut on your radio. The relays on the TL-922 are very SLOW 
switching from transmit to receive. They frequently hot switch. This is 
why the amplifier arcs in the band switch and plate tuning capacitor.

If I had another one, I would convert to QSK with fast relays and 10 
volts of key line voltage @ > 10ma.

IF your looking for a out of the box solution, the Harbaugh SK220 (for 
the SB-220) would work in the TL-922. The SK200 (for the SB-200 would 
NOT work).

73
Jim W7RY


On 10/18/2013 5:13 PM, rejean leveille wrote:
> Hi Jean
>
> The best way to found out if TL 922 was modified for low voltage keying is
> by taking a voltage measurement at the rca key-in jack.
> If you got +100 volts no, if yes it could be 12 or 24 v dc.
> Now by looking at the FT1000 D manual the rear rca TX_Gd could be used but
> first you need to active the internal radio relay if needed. Internal switch
> S1002 must be ON. This relay can handle .5A/125v ac, 2A/30v.
> The other option is to use the band data DIN connector, pin 2 TX_Gd & 3
> ground. Now for this one we normally keep S1002 turned Off, you must check
> what voltage and current this switching transistor could drive your relay
> voltage and current. We normally use this one for very fast 1ms switching
> like full break-in cw. Of course your TL922 needs vacuum relays or pin diode
> to prevent hot switching. Any mechanical relay will be destroyed in a short
> time like factory built TL 922.
>
> 73, Rejean va2am
>
> -----Message d'origine-----
> De : Amps [mailto:amps-bounces at contesting.com] De la part de Behiels
> JeanPierre
> Envoyé : October 18, 2013 5:14 PM
> À : amps at contesting.com
> Objet : [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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