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Author Topic: Swam 700CX WARC / CB MOD Help to REVERSE  (Read 476 times)
AC0FA
Member

Posts: 298




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« on: February 27, 2007, 01:40:00 PM »

Hi, All
I have been searching for information on WARC/CB modifcations that might have been done on my 700cx so I Can find and reverse them.

It would seem a previous owner may have attempted such a mods and they did not turn out well.

I have found various capacitors with strange values. 20M in particular seems to be resonating high in the band 14.350. The grids in the finals appear to be fix tuned.

I need some help figuring out what would have been changed and where to look.

Thanks
Erik AC0FA

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KA5N
Member

Posts: 4380




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« Reply #1 on: February 27, 2007, 04:32:19 PM »

Hi,
The input to the finals is the plate tuning of the driver.  For 10 meters C304 (100pf), for 15 meters C305 (27pf) and for 20 meters C306 (50 pf) are the ones that control the tuning.  The driver plate is not fixed tuned, there is a variable ganged with another which tunes the input to the driver and the plate of the driver.  Another possible source of trouble could be in the bandswitch, dirty contacts, bent contacts, burnt contacts, etc.
73 Allen KA5N
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W9GB
Member

Posts: 2659




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« Reply #2 on: February 27, 2007, 04:39:59 PM »

You can start with the Swan 700CX manuals and schematics

BAMA
http://bama.sbc.edu/swan.htm

6-meter group:
http://6mt.com/swtv2.zip
http://6mt.com/sw700cx.zip

You may wish to e-mail KD6ZR for some photogrpahs of his 700CX for your restroation assistance!
http://www.accessatc.net/~rjlutz/vint_ssb.html

Swan Radio Network http://www.angelfire.com/ny2/hamradio/index.html

Cubic Communications, former manufacturer of both Swan and Cubic amateur radio equipment, has authorized Stephen Judd (formerly Brock Publications) to produce Instruction and Operating Manuals associated with all Swan and Cubic amateur radio communications equipment and accessories.
In recent years, Atlas and Siltronix Radio manuals have been added to the list of available publications.

Orders and inquiries can be made to:

STBJ Productions
Stephen Judd
1503 East Highland Trails Rd
Enoch Utah 84720
(435) 867-1431
SwanRadios@Yahoo.Com
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