Hi John:
Thanks for your note. I cannot do that as my two homebrew amplifiers and one
Heathkit SB-220 all use higher, and varied, voltages.
I will try using the TX EN line however, and will let you know how it goes
as soon as I get to it. I'm in the middle of adding SSB capability to a
homebrew 20-meter receiver, and, as of last night, got my transmit mixer
running. So, I now have SSB output on 20. Next comes the buffers and PA for
it, and this is really the focus of my attention right now. Once I get that
working I'll have an all homebrew xvcr for 20 meters!
I guess I really have a lot of a balls in the air at the same time. HI. But,
I'll keep you posted. Thank you again for your thoughts and notes.
Vy 73, AI2Q, Alex in Kennebunk, Maine .-.-.
-----Original Message-----
From: John Hill [mailto:dsp@timewave.com]
Sent: Saturday, February 05, 2000 5:53 AM
To: ai2q@ispchannel.com
Subject: Re: Info required
At 09:44 AM 1/31/00 -0500, you wrote:
>Dear Timewave technical:
>
>I own an older DSP-59 product, which I like very much. Recently, I've
>decided to use it with a Ten-Tec Omni-V transceiver. The Omni's accessory
>relay is already being used to key external amplifiers, so I am seeking an
>alternate way to "bypass" the Timewave DSP-59 on CW. I don't know if you're
>familiar with the Omni-V, however here's what I see.
>
>Near as I can tell, transistor Q13 on the Omni-V's 81456 Control Board
>should be able to be used to bypass the DSP when operating CW, so I can
hear
>the Omni's sidetone without having the tone fall outside of the passband
>when the DSP filter is set to 50 or 100 Hz, or so.
>
>Open-collector transistor Q13 is active-low when the Omni-V goes into
>Transmit mode, and it looks like Q14 and its 33 kohm base resistor acts as
a
>pull-up for the line on Q13's collector. The Timewave manual offers very
>little information, but does include a schematic. It seems to be that if I
>put the DSP-59 in Active Low mode by shunting pins 1 and 2 on the DSP-59, I
>could let Q13 sink the current required in the optocoupler of the
>DSP-59--and at the same time drive Q14 normally through the TX EN plug on
>the back of the Omni-V.
>
>Have any of your users/customers tried this, perhaps using a small junction
>box external to the Omni's TX OUT/TX EN phono plugs?
>
>Your help is appreciated. Vy 73, AI2Q, Alex Mendelsohn in Kennebunk, Maine
>
Hi Alex;
You can parallel the DSP-59 PTT input with the signal that keys
(low going) your amplifier, provided the amplifier's key-up voltage is
not more than 40V. Typically, modern amplifiers have a 12V relay on the
T/R input and the DSP-59 will parallel just fine with it. Many customers
do that when there is no other (low going) PTT output on their rigs.
73, John Hill, NJ0M
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