Hi Dale. Since it will travel at roughly the speed of
light, to gain even a couple of microseconds would
require a line very,very long. Would certainly put
new meaning in to the term "Wireless"!
de KL7HF
-----Original Message-----
From: Dale L. Martin <kg5u@hal-pc.org>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Sunday, September 20, 1998 9:07 PM
Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK
>
>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>
To: <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>
To: <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>
To: <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:
>http://www.contesting.com/tentecfaq.htm
>>> >> >Submissions: tentec@contesting.com
>>> >> >Administrative requests: tentec-REQUEST@contesting.com
>>> >> >Problems: owner-tentec@contesting.com
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>http://www.contesting.com/km9p/search.htm
>>> >> >
>>> >> >
>>> >>
>>> >
>>> >
>>>
>>
>>
>>--
>>FAQ on WWW:
>http://www.contesting.com/tentecfaq.htm
>>Submissions: tentec@contesting.com
>>Administrative requests: tentec-REQUEST@contesting.com
>>Problems: owner-tentec@contesting.com
>>Search:
>http://www.contesting.com/km9p/search.htm
>>
>>
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
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