[Johnson] Is there a Ranger Keyer/Bias Version Between 1954 and1958 ?

[David C. Hallam]

Documentation for Johnson rigs seems hard to come by.  Any manuals or
schematics should be verified by comparison to your rig.  I have an Invader
200 and two manuals for it.  One is the manual delivered with the rig.  I
have found errors in the voltage and resistance charts, parts missing or
incorrect in the BOM, and undocumented circuit and parts changes in the
schematic.  On the other hand, I suspect Johnson was no different from any
of the equipment manualcturers of the era.

David
KC2JD

-----Original Message-----
From: johnson-bounces at mailman.qth.net
[mailto:johnson-bounces at mailman.qth.net]On Behalf Of C E
Sent: Tuesday, March 07, 2006 3:52 PM
To: Larry Rau; Johnson-List
Subject: Re: [Johnson] Is there a Ranger Keyer/Bias Version Between 1954
and1958 ?


Hi Larry:
Something tells me that this may have been an
"interim" Ranger.

On the schematics from Bama, did you download the
Dejavu viewer? That would be most helpful to your
cause. Cal, N6KYR/8

--- Larry Rau <captainlarry at jps.net> wrote:

> Basics:
>
> I have following manualsand schematics:
>
> 1954 Ranger Schematic..... no  12AU7 keyer tube and
> no V-14 6AL5 Bias
> Rectifier (cathode keying and mod bias resistor)
> 1958 RangerSchematic... has added plate by VFO with
>  12AU7 and
> 6AL5..supplying bias to modultor and keying circuit.
>
> My Odd Ranger Problem :
>
> I just got a ranger, which has plate  mounted by the
> VFO...with the Keyer
> and Bias Tubes...
> BUT... the modulator retains the old cathode
> resistor bias from the 1954
> version... ..and the keyer doesnt match the
> schematic from 1958... despite
> being obviously original.
>
> So what I have is a keyer, with a bunch of 2 watt
> resistors in a divider
> network that has nothig to do with the schematic of
> 1958.... and a 6AL5 bias
> rectifier... without the voltage divider to provide
> -28v modulator bias...
> only keyer bias.
>
> In other words.. I've  got no docs on this apparent
> intermediate version of
> the keyer/bias supply.
>
> Anybody got any ideas...
>
> Please dont refer me to BAMA... I cant download
> anything off that *&O:LRLF
> !!! thing !
>
> Is it worth the trouble to re-wire this to the newer
> specs... ?
> (somewhat hard to do without the proper diagram for
> this version )
>
> larryW6WUH
>
>
>
>
>
> Johnson mailing list
> Home:
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>


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