[GreenKeys] Dovetron Advice

[Paul Heller]

Keep those questions coming. I’m not far behind you, Steve. 

Paul
W2TTY


> On Dec 4, 2017, at 10:20 AM, Steve Garrison <steve.n4tty at gmail.com> wrote:
> 
> OK folks, here is the real start of the dumb questions I said I might be asking that the majority voted to hear about and not send of list, so don’t say I didn’t warn you!
>  
> On the back of my Dovetron I have a jack labeled ASFK and another jack labeled PTT.  On the front of the unit is a switch labeled RECEIVE when switched one way and TRANSMIT when switch the other way.  Without having done any measuring with a meter to see if throwing the switch to the TRANSMIT position grounds the PTT jack, I was just making an assumption that might happen.  Next step is to verify this, but can anyone provide an answer as to what that TRANSMIT switch position actually does and what is the function of the PPT jack?
>  
> More “dumb” questions to follow!
>  
> Steve G./N4TTY
>  
> From: Jack [mailto:wa2hwj at att.net] 
> Sent: Monday, December 04, 2017 10:43 AM
> To: N4TTY at ARRL.NET
> Cc: greenkeys at mailman.qth.net
> Subject: RE: [GreenKeys] Dovetron Advice
>  
> 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> [mailto: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 <mailto: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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