[GreenKeys] In/out levels!

[Don and Diana Cunningham]

Larry,
From what I've seen of the old ST-6's, not all have the AFSK generator.  The
ST-6 is only a demodulator, unless the "optional" AK-1 (or the crystal
controlled XTK-1 or some such nomenclature) is installed.  If you have the
AK-1, you will have the 2 mv and 20mv outputs, even if they aren't brought
to the back panel.  I prefer FSK myself, since it is easier for me to
control the rig, but Gil is right, a very simple pad (or old stereo L-Pad
you used for speakers) will control the 20mv output just fine.  The 2mv
seemed to be a nice match for all of the old Drake high impedance mic
inputs, and much easier than the FSK "mod" to the PTO, hi hi.  You're sure
bringing back the "good old days", Larry!!  Hope to see you on that dead 20m
band soon.  I'm close to getting some old Hal stuff on line myself.
Vy 73,
Don, WB5HAK
----- Original Message -----
From: <telegrapher@att.net>
To: <greenkeys@mailman.qth.net>
Sent: Tuesday, June 03, 2003 8:49 PM
Subject: [GreenKeys] In/out levels!


> Thinking i'd get my ST-6 hooked into my Yaesu FT-990 and see what
> happens when i put out a CQ on a dead (more or less) 20 meter band.
> Hmmmm.  Things aren't what they seem.
>
> FT-990 Patch in jack which is where the AFSK from the ST-6 or TU goes
> accepts 2 MV (a 600 ohm load).  This is "optimum" per the book.  Now on
> the other hand the st-6 has 2 AFSK outputs.  WEll see tonight that mine
> doesn't have either, just an FSK jack.  Different indians here......
>
> ANyway the normal ST-6 has 2 outputs.  One 20MV and the other 100MV both
> from or into a 600 ohm load.  Therefore, the ST-6 would not be useable
> without some sort of pad between the 20MV out and the 2 MV input jack
> right?  ANyone else have an FT-990 that they could look at the
> documentation to see if it agrees with what mine says.  I would think
> that the 2 MV level would be way to low.  Nope, I haven't tried it out
> to see what it sounds like.  Remember i said i don't have an AFSK output
> on this unit.  FSK would be the better method anyway.  Don't have to
> worry about the overdriving of the audio chain with that type signal and
> the 990 will handle FSK type operation.
>
> I used to run an ST-6 into my Drake T-4X mic input with no problems at
> all.  However, this 990 is a bird of a different breed.  TO much drive
> could cause all sorts of bad sounds on a transmitted signal.
>
> ANyone else run into this situation or are you just plugging a TU into
> the transmitter and letting it rip!!!!
>
> Discussions?
>
> Larry
> W0OGH
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