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Modify a Modified Ranger (Semi-Early style)




 
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Author Topic: Modify a Modified Ranger (Semi-Early style)  (Read 2018 times)
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N8ETQ
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Mort


« on: November 07, 2015, 01:29:23 PM »


       Yo'


            I'm Doing the WA3DSP Mods to a Modified Ranger.
Doug's excellent write up on this has been pretty straight
forward to this point. I'm getting Frustrated by the
VFO, Buffer, Multiplier keying. We had this Ranger working
real well about a year ago and my cust. liked it so much
he used it all the time but didn't make any provision
to control AC input Voltage.  Alas, he came back all
"Cooked out".

       In his current configuration he does every
thing he should except provide grid current to the PA
in "PHONE" unless I press the CW Key.  The "ZERO" func-
tion works fine.  I have not tested the Modulator yet
but have nice waves to the EL34 grids, The MOSFET power
and "DRIVE" controls work well, The LV MOSFET regulator
is ROCK SOLID at 300V.  The EL34 grids are getting driven
by a Phase inverter. VERY NICE! A link to Dougs write up:

http://www.crompton.com/hamradio/JohnsonRanger/RangerRestoration.html


            This is where this Ranger has been modified
by a previous owner to incorporate that Sequenced keyer
board and fixed Bias for the Modulators. So here we go
with a few questions:

    1. Did Johnson offer the Keyer board as an "ADD ON"
       to existing kits already in the field?

    2. If so does anyone have a copy of the instructions
       supplied with it, or know if there were any changes
       to the operate switch SW4A? (Front most wafer)
   I have SW4B working correctly.

     3.What sort of Voltage level was developed by the
        6AL5 Bias Rect. when powered via the taps off
   power XFMR? Maybe I'm getting too much.



             I call this thing "Semi-Early style" since
he has the keyer board yet No taps on the power xfmr for
it. The Mod was getting power via, (You Guessed It) a
pair of 20K 20W "R" off the LV taps. Also Function SW4B
has no pin 9 Contact, The lug is there for the Ip shunt.

TIA

73

/Dan


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Pete, WA2CWA
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« Reply #1 on: November 07, 2015, 01:58:36 PM »

The add-on chassis to hold the keyer circuitry to provide grid-block keying and also changes to the bias circuitry, was made available roughly around October 1954 for use in early Rangers. There is no part number for the add-on on the manual, but the drawing number for the schematic is Q25.352.
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
N8ETQ
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Mort


« Reply #2 on: November 07, 2015, 05:25:34 PM »




   Thanks Pete,


         The more you know about these things, the
less you wanna know!  Most people know the only change
was the paint..  Late model rangers were actually
Ranger 2's except for the paint and that 6 meter
thing.

         So you, being the "King of Manuals" know
of no supplement or addendum to the original that
called for modification of SW4A? I'm just using
"Late model Ranger" schematics..

Thanks Man,

73


/Dan

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Pete, WA2CWA
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« Reply #3 on: November 07, 2015, 07:47:12 PM »

 Thanks Pete,
 The more you know about these things, the less you wanna know!  Most people know the only change was the paint..  Late model rangers were actually Ranger 2's except for the paint and that 6 meter thing.

 So you, being the "King of Manuals" know of no supplement or addendum to the original that called for modification of SW4A? I'm just using "Late model Ranger" schematics..

Thanks Man,

73
/Dan

You said: "Late model rangers were actually Ranger 2's"

Probably somewhat true if you ignore the additional tube, numerous circuit changes, component changes, and paint color. I sure wouldn't try to use a Ranger II schematic to try and repair a Ranger early or late model.

When adding the keyer stuff, a connection is made from pin 7 of the 12AU7(keyer) to the existing key line connected to pin 9 of SW4A. I see no other changes made to SW4A.


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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
N8ETQ
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Mort


« Reply #4 on: November 07, 2015, 10:04:40 PM »

 
/Dan[/quote]

You said: "Late model rangers were actually Ranger 2's"

   No, I said:

" Late model rangers were actually Ranger 2's except for the paint and that 6 meter thing."


Probably somewhat true if you ignore the additional tube, numerous circuit changes, component changes, and paint color. I sure wouldn't try to use a Ranger II schematic to try and repair a Ranger early or late model.



  Nor would I, What is your point man, Obviously moving the freq
coverage of a TX will require a few circuit/Value changes. And
the additional doubler to multiply the padded 40M VFO. Other than
that they are identical..



When adding the keyer stuff, a connection is made from pin 7 of the 12AU7(keyer) to the existing key line connected to pin 9 of SW4A. I see no other changes made to SW4A.

[/quote]
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