Go to http://www.harbach.com and to the SB-220 Repair and Upgrade Items.
Then look at the SB-220 'Soft Key.' That circuit enables the tranceiver to
key the SB-220 seeing only 0.7 volts at 1.5 milliamperes. That will keep
the Ten-Tec relay contacts from pitting from switching such high current
spikes as the SB-220 generates when keyed.
This is true for ALL Ten-Tec rigs.
Mike N4NT@wireco.net
----- Original Message -----
From: "AI2Q Alex" <ai2q@ispchannel.com>
To: "'John Hill'" <dsp@timewave.com>
Cc: "Tentec (E-mail)" <tentec@contesting.com>
Sent: Saturday, February 05, 2000 11:03 AM
Subject: [TenTec] RE: Info required
>
>
> 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
> Email Tech Support
>
> Timewave Technology Inc.
> 58 Plato Blvd. E.
> St. Paul, MN 55107 U.S.A.
> Voice: 651-222-4858
> FAX: 651-222-4861
>
> Visit our Web Page
> http://www.timewave.com
>
>
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>
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