Feed PTT thrue coax for DB6NT Transceiver

[Martin RATH]

Hi !

I'm planning on using my K2 as an IF for a remote 1296 MHz DB6NT
Transverter. I would love to switch the PTT thrue to coax line. For that
I would need 3 to 12V on the center pin of the coax. Can I just use the
pin 6 (8T) of the J13 connector and inject this into the antenna socket
of my KAT2 like it is done on a FT 290R2 or IC 202 like describde there :

http://www.btinternet.com/~jewell/FT290R2.html

http://perso.orange.fr/f1bzg/technique.htm

Thank you for your help !

Martin

F4UKP / DD4UKP
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[Don Wilhelm-3]

Martin,

I would strongly suggest using the 8R signal instead - when inverted it
is the same as the signal from the KPA100 ext amp keying interface or
the Amp Keying interface for the base K2 that is offered by Tom N0SS.

8R can be set to a delay in the K2 menu and is present about 15ms prior
to the onset of RF, 8T cannot be manipulated by the menu parameters.

The amp keying interface grounds when active, but you could drive a
small (fast) relay that will in turn provide your required voltage.

73,
Don W3FPR

Martin RATH wrote:

> Hi !
>
> I'm planning on using my K2 as an IF for a remote 1296 MHz DB6NT
> Transverter. I would love to switch the PTT thrue to coax line. For that
> I would need 3 to 12V on the center pin of the coax. Can I just use the
> pin 6 (8T) of the J13 connector and inject this into the antenna socket
> of my KAT2 like it is done on a FT 290R2 or IC 202 like describde there :
>
> http://www.btinternet.com/~jewell/FT290R2.html
>
> http://perso.orange.fr/f1bzg/technique.htm
>
> Thank you for your help !
>
> Martin
>
> F4UKP / DD4UKP
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
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>

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[Tom Hammond-3]

Hi Martin:

At 07:57 06/12/2007, Don Wilhelm wrote:
>I would strongly suggest using the 8R signal instead - when inverted
>it is the same as the signal from the KPA100 ext amp keying
>interface or the Amp Keying interface for the base K2 that is
>offered by Tom N0SS.

See: http://www.n0ss.net/k2_t-r_rly_drvr.pdf

73,

Tom   N0SS


>8R can be set to a delay in the K2 menu and is present about 15ms
>prior to the onset of RF, 8T cannot be manipulated by the menu parameters.
>
>The amp keying interface grounds when active, but you could drive a
>small (fast) relay that will in turn provide your required voltage.
>
>73,
>Don W3FPR

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[Martin RATH]

Don and Tom,

Thanks to both of you for your answers. I understand the flexibility
that 8R gives your in term of T/R switching. Can I still feed my +8V to
the center pin of the coax to switch my Transverter thrue the RF in ?

Tom I saw your t-r switch ! If I understand it right on TX there is +6V
on P1-8. Could I use these 6V (as i need a 3-15v range) and feed them to
the coax ?

Sorry for all my dumy questions !

Sincerly

Martin
DD4UKP / F4UKP
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[Don Wilhelm-3]

Martin,

I would not recommend that you take the 8 volts out of the K2.

As an alternative, develop the required DC voltage at the transverter
end, and then ground it during transmit with the K2 amp keying circuit.

OR - key a relay at the K2 end with the amp keying circuit, then use the
relay contacts to apply voltage (from a separate supply) to the
transverter.  The 8 volts inside the K2 should not be loaded down with
external devices.  If the current requirement is very low, it may be OK,
but in this case, we do not know the current requirement, so a relay is
my recommended solution.

73,
Don W3FPR

Martin RATH wrote:

> Don and Tom,
>
> Thanks to both of you for your answers. I understand the flexibility
> that 8R gives your in term of T/R switching. Can I still feed my +8V to
> the center pin of the coax to switch my Transverter thrue the RF in ?
>
> Tom I saw your t-r switch ! If I understand it right on TX there is +6V
> on P1-8. Could I use these 6V (as i need a 3-15v range) and feed them to
> the coax ?
>

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[w2bvh]

Some transverter owners like to do float on transmit  and ground on
receive. If you forget to plug in the key line (or if it breaks) the i-f
rig doesn't transmit into the transverters receive chain.

73,
Lenny W2BVH
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