[GreenKeys] Dovetron Advice

[Jack]

Steve,

 

If the Dovetron has the AFSK option (sometimes it's not there)
make sure the

tones are set for the 2125/2295 170 HZ shift. You can then plug
the tones

into your SSB rig's mic input and set the carrier level (TX power
output) to around

50% of rated CW output.  The tones generate the FSK signal.

A good way to control transmit/receive function is to switch the
tones on and

off into the rig (use VOX in the transmitter). 

 

I use the direct FSK feature in my Kenwood TS870 and key it with
an opto-coupler

in the TTY loop. That's the best way for good FSK and it doesn't
need the

Dovetron to do anything. Using AFSK tones into an SSB rig could
cause

splatter and possibly make the rig run hot. With this setup, I
just use

the Dovetron's external "standby/receive" feature to put the TU in

standby when transmitting. A suitable switch (DPDT) can put the TU
in standby and

turn on the transmitter.

 

If you don't put the TU in standby, it could erratically trigger
the transmitted FSK.

 

Jack K2TTY

 

 

 

 

From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Steve
Garrison
Sent: Monday, December 4, 2017 9:56 AM
To: greenkeys at mailman.qth.net
Subject: [GreenKeys] Dovetron Advice

 

And How-To on using a Dovetron MPC-1000R with my M28 to key my
radio for the upcoming ARRL TTY Round-up.  All advice appreciated.
While I have used the Dovetron on multiple occasions to copy off
of the air, I have never transmitted RTTY, so need lots of advice.
Hope I haven't waited to long to jump into the deep end of the
pool with the contest just a month away.

 

Steve G./N4TTY

 

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