[TenTec] Omni QSK with Alpha's 87A QSK

[Dale L. Martin]

Gentlemen,

Years ago, Collins Radio used a technique of specifying the
length
of control/rf cable between the transceiver/transmitter and
amplifier to control the keying sequence of the amplifier's relay
and the readiness of the amp to receive the transmitter rf
signal.

I'm wondering if that technique wouldn't also be a benefit in
the situation where you are T'ing the TX Out between the amp and
the TX EN.  If the TX Out to TX EN cable length is substantially
longer, you may gain a few dozen microseconds (or more??) delay
between the amp and radio keying.


Just a thought....


73,
dale, kg5u

-----Original Message-----
From: w6ru <w6ru@lightspeed.net>
To: Paul Christensen <paulc@mediaone.net>; tentec@contesting.com
<tentec@contesting.com>
Date: Sunday, September 20, 1998 20:19 PM
Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK


>
>You are correct Paul...I forgot about the "d16" diode already
connected to the
>"TX EN" jack ...only requiring one diode in the 87A relay line.
>I will make up a cable and try this and report back.
>Terry - W6RU
>
>Paul Christensen wrote:
>
>> A valid point Terry, although isolation may not be as good as
the
>> transistor, but then again, it may not need to be.  In my
case, I need the
>> added isolation, because I create an open-collector amp key
line for my
>> choice of three amps and four rigs!  In essence, I have a high
isolation
>> keyed buss line.
>>
>> Taking your suggestion, it appears that only one external
diode is required.
>> D16 performs the necessary isolation after summing on the TX
EN line.
>>
>> It would be interesting to see if this works in conjunction
with an RCA "Y"
>> adapter, running two ends between TX OUT and TX EN, then
running the third
>> wire on out to the external diode and then the amp.
>>
>> In any event, let us know how this works using the external
steering diode.
>>
>> 73,
>>
>> -Paul, W9AC
>>
>> -----Original Message-----
>> From: w6ru <w6ru@lightspeed.net>
>> To: Paul Christensen <paulc@mediaone.net>;
tentec@contesting.com
>> <tentec@contesting.com>
>> Date: Sunday, September 20, 1998 8:47 PM
>> Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK
>>
>> >Paul,
>> >Your modification requires a person to go inside the radio
and make a
>> change to
>> >a SMC circuit board in regards to Q16.
>> >Q11's collector is already present at the "TX OUT" jack. This
is what I am
>> >suggesting Jim and others who do not want to get inside their
radios, use
>> to key
>> >BOTH the "TX EN" jack and the "RELAY" jack on the
87A...through steering
>> diodes
>> >external to the radio. Take the keying line from the "TX EN"
jack through a
>> >diode...take the 87A "relay" jack line through a diode...sum
them together
>> into
>> >the "TX OUT" jack.
>> >
>> >Terry - W6RU
>> >
>> >Paul Christensen wrote:
>> >
>> >> Terry:
>> >>
>> >> The steering diodes are not necessary.  All the parts
needed are already
>> >> there.  The input to R29 is bridged across the TX OUT line.
Then, the
>> >> collector of Q16 is sent directly to the RELAY RCA jack.
>> >>
>> >> End of Modification.
>> >>
>> >> -Paul, W9AC
>> >>
>> >> -----Original Message-----
>> >> From: w6ru <w6ru@lightspeed.net>
>> >> To: Jim Reid <jreid@aloha.net>; tentec@contesting.com
>> >> <tentec@contesting.com>
>> >> Date: Sunday, September 20, 1998 8:34 PM
>> >> Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK
>> >>
>> >> >
>> >> >My error !
>> >> >This time I see the keying of this circuit...not sure why
it didn't show
>> >> the
>> >> >first time.
>> >> >THIS MAKES IT SIMPLE...
>> >> >Just let that "TX OUT" jack key BOTH the "TX EN" jack on
the Omni 6 AND
>> key
>> >> the
>> >> >"RELAY" jack on the 87A. I would use two steering diodes,
one in each
>> >> circuit
>> >> >to isolate the circuits from each other in the receive
mode.
>> >> >Hope this helps.
>> >> >Terry - W6RU
>> >> >
>> >> >
>> >> >--
>> >> >FAQ on WWW:
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>> >> >
>> >> >
>> >>
>> >
>> >
>>
>
>
>--
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>
>



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