[Johnson] Johnson Viking Navigator - Dial Problem

[Guy Olinger, K2AV]

Not doing what you think I'm doing. Includes the Courier bypass and
delay circuitry and reed switches for the RF. E.g..

Event    Action
key      Impose RF switch, ground RX ant, start delay1, engage speaker
mute (diode switch, fast enough to beat switch click)

delay1   Impose keyline, start delay2

delay2   engage speaker reduce (diode switch through L-pad, set for
comfortable level of transmit reception)

keyup    start delay1, delay3

delay3   engage speaker mute (just before delay1), release speaker
reduce

delay1   release keyline, start delay 4

delay4   release rf switch, unground RX ant, start delay 5

delay5   release speaker mute. Speaker mute can be set to a level to
allow a comfortable level of transient to make the transmitted signal
sound "authentic"


This gives a really clean sound. No TR switch noise on higher bands.
No clunks, clicks or thumps when keying. No screeching RX keydown.
Easy to add an amp bypass/engage. No noise from amp. Delays set to
minimums that allow closure and settling before rf, or just barely
beating thumps and clicks. 4-5 ms usually does it. Most speeds you're
listening to interbaud spacings of 30 or so ms so lots to work with.

If you want it to work at 50 wpm and hear between the dits, you can
still use the vacuum tube, but switch between the antenna and the
cathode follower so you're never in RX mode listening through the
tube, or listening to the amp's diode noise. You can merge the
circuits so the only time you really hear through the cathode follower
is when the relay hasn't made yet.

You can easily cool down the unit with a CPU fan, minus the heat sink.
I have about a dozen laying around.


----- Original Message -----
From: "Ed Tanton" <n4xy@earthlink.net>
To: <johnson@mailman.qth.net>
Sent: Saturday, March 16, 2002 7:57 AM
Subject: RE: [Johnson] Johnson Viking Navigator - Dial Problem


> Don't gut the thing... it works fine just like it is... and every
one
> I've ever had ran that hot. For between the dit breakin, there's
nothing
> like one of these.
>
> 73  Ed Tanton  N4XY  <n4xy@arrl.net>
>
> Ed Tanton  N4XY
> 189 Pioneer Trail
> Marietta, GA  30068-3466
>
> website:   http://www.n4xy.com
>
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