KEYOUT PTT only when transverter band selected

[Julian, G4ILO]

I don't have a linear amplifier. I do have a transverter, and I use the KEY OUT jack to put it into TX. Trouble is, it puts the transverter into TX whatever band I'm using. For LO stability reasons (not to mention that I can never remember to switch the transverter off when I'm not using it) I'd prefer to be able to leave the transverter switched on but only receive a PTT signal when the VHF band is selected. I think that means I'd need a circuit that combines the state of DIGOUT0 with KEYOUT-LP, such that it grounds the transverter PTT input when DIGOUT0 is 0V and KEYOUT-LP is grounded. Has anyone made something like that?

[Don Wilhelm-4]

Julian,

Does your transverter have an "enable" input signal - hopefully 5 volts
active and 0 volts inactive?  If so, you can connect it to the K3  AUX
I/O pin 7 (XVTR ON) and set the menu CONFIG: XVn ON.
Of course, this AUX I/O pin is shared with TX INH, so if you are using
the TX INH function, that will not work.
BUT, you can always decode the band data outputs for the transverter
band you are using and use that for a transverter enable (or gate the
PTT input to the transverter with the band data decoded).

73,
Don W3FPR

Julian, G4ILO wrote:

> I don't have a linear amplifier. I do have a transverter, and I use the KEY
> OUT jack to put it into TX. Trouble is, it puts the transverter into TX
> whatever band I'm using. For LO stability reasons (not to mention that I can
> never remember to switch the transverter off when I'm not using it) I'd
> prefer to be able to leave the transverter switched on but only receive a
> PTT signal when the VHF band is selected. I think that means I'd need a
> circuit that combines the state of DIGOUT0 with KEYOUT-LP, such that it
> grounds the transverter PTT input when DIGOUT0 is 0V and KEYOUT-LP is
> grounded. Has anyone made something like that?
>  
>

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[Joe Subich, W4TV-4]

The circuit is called an OR gate - output high if either
input is high.  The easiest way to homebrew one is to use
a dual opto-isolator with the outputs in series ...

The attached assumes DIGOUT will sink a few mA - adjust R
for the current required by the opto-isolator you use.

73,

   ... Joe, W4TV
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Julian, G4ILO
> Sent: Sunday, July 12, 2009 1:19 PM
> To: [hidden email]
> Subject: [Elecraft] KEYOUT PTT only when transverter band selected
>
>
>
> I don't have a linear amplifier. I do have a transverter, and
> I use the KEY OUT jack to put it into TX. Trouble is, it puts
> the transverter into TX whatever band I'm using. For LO
> stability reasons (not to mention that I can never remember
> to switch the transverter off when I'm not using it) I'd
> prefer to be able to leave the transverter switched on but
> only receive a PTT signal when the VHF band is selected. I
> think that means I'd need a circuit that combines the state
> of DIGOUT0 with KEYOUT-LP, such that it grounds the
> transverter PTT input when DIGOUT0 is 0V and KEYOUT-LP is
> grounded. Has anyone made something like that?
>
> -----
> Julian, G4ILO. K2 #392  K3 #222.
> * G4ILO's Shack - http://www.g4ilo.com
> * KComm - http://www.g4ilo.com/kcomm.html
> * KTune - http://www.g4ilo.com/ktune.html
>
> --
> View this message in context:
> http://n2.nabble.com/KEYOUT-PTT-only-when-transverter-band-sel

ected-tp3246434p3246434.html

Sent from the Elecraft mailing list archive at Nabble.com.
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[Julian, G4ILO]

On 12/07/2009, Don Wilhelm <[hidden email]> wrote:

> Julian,
>
> Does your transverter have an "enable" input signal - hopefully 5 volts
> active and 0 volts inactive?  If so, you can connect it to the K3  AUX
> I/O pin 7 (XVTR ON) and set the menu CONFIG: XVn ON.
> Of course, this AUX I/O pin is shared with TX INH, so if you are using
> the TX INH function, that will not work.
> BUT, you can always decode the band data outputs for the transverter
> band you are using and use that for a transverter enable (or gate the
> PTT input to the transverter with the band data decoded).
>

It doesn't appear to. I think that's something unique to the Elecraft
range of transverters, unfortunately.
--
Julian, G4ILO
G4ILO's Shack: www.g4ilo.com
G4ILO's Blog: www.g4ilo.com/blog.html
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[ww2r2]

Having made requests of Elecraft at the end of last year for a "eot only
when transverting" from the k3 with no success, I developed the "eot only
when xverting" circuit as part of my auto switching transverter interface
written up at http://g4fre.com/k3vhf.pdf. It will also appear in the
proceedings of the Central States VHF Society Conference happening next
weekend

Dave

WW2R
------------------------------

Message: 8
Date: Sun, 12 Jul 2009 10:18:42 -0700 (PDT)
From: "Julian, G4ILO" <[hidden email]>
Subject: [Elecraft]  KEYOUT PTT only when transverter band selected
To: [hidden email]
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=us-ascii


I don't have a linear amplifier. I do have a transverter, and I use the KEY
OUT jack to put it into TX. Trouble is, it puts the transverter into TX
whatever band I'm using. For LO stability reasons (not to mention that I can
never remember to switch the transverter off when I'm not using it) I'd
prefer to be able to leave the transverter switched on but only receive a
PTT signal when the VHF band is selected. I think that means I'd need a
circuit that combines the state of DIGOUT0 with KEYOUT-LP, such that it
grounds the transverter PTT input when DIGOUT0 is 0V and KEYOUT-LP is
grounded. Has anyone made something like that?


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