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1-6 of 6 messages
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Siltronix 1011c help
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by KC9EAE on January 12, 2005
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I recently aquired this radio. so far I have replaced a few tubes and some bad caps and gave it a good cleaning. This radio had been modded for cb transmit. I was told this can lead to problems with the alingment of the radio. is there anyone who can tell me how to reverse the conversion?
Right now I am currently tech class. But I am studying morse code to upgrade my ticket to make use of HF.
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RE: Siltronix 1011c help
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by WB2WIK on January 14, 2005
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I haven't seen one of these rigs in years, but if I recall correctly it was made by Swan Electronics in Oceanside and had a VFO for frequency control, just like all the other Swans of the day. That would of course make it very, very illegal to use on CB even if it were restricted to 5W of power and met all the other requirements.
Although I *do* understand you're not talking about using it on CB, but on converting it "back" to ten meter operation.
If it's the typical VFO-controlled heterodyne transceiver, there may only be one crystal oscillator/mixer in the RF chain; that, plus the balanced modulator (which is another mixer that mixes audio and RF to create the sideband signal) pretty much makes up the whole transmitter signal system. And I think that's the case. If so, then "converting" the rig would mean only changing the crystal or crystals in the heterodyne L.O.
ICM (International Crystal Manufacturing in Oklahoma) undoubtedly has the crystal formula on hand, as they do for just about all ham gear ever made, and could provide you with a replacement crystal or crystals as required.
If you had the manual, with the schematic diagram, that would be very helpful in pinpointing precisely what needs to be done.
I brought up the VFO part because if the 1011 is VFO controlled like the other Swans of the era, it probably drifts a lot and it's not a rig I'd want to use on ten meters :) !! (There used to be a saying about the HF "Swan Net." If somebody asked what frequency the Swan Net was on, the answer would be, "Oh, just tune anywhere and the net will drift by."
WB2WIK/6
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RE: Siltronix 1011c help
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by WB6BYU on January 14, 2005
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If I recall, the rig had 10m coverage and also 11m on the
VFO "for receive only". Of course, it really was designed
to be moded so it would transmit on 11m. But, unless
someone got inside and "turned all the slugs for max smoke",
it may work just fine on 10m as is. I'd certainly try it
out before you attempt any further fixing. (And hams can
certainly be as bad at making a mess of readjusting their
rigs as CBers can!)
Go ahead and turn it on as it is - it won't hurt anything
to listen, and the CB mod (which simply enabled transmit
on the 11m segment) won't cause any problems. If you have
problems keeping stations tuned in for very long, then
you'll know what Steve means about drift. So even just by
listening you will get a feel for whether it is a rig
that you want to use on the air.
Steve - you were refering to their 6m rig, the "Swan
Too-Drifty"?
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RE: Siltronix 1011c help
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by KC9EAE on January 14, 2005
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Thankyou for the help.. I'm working on getting a dipole together for it. as I have a couple friends with general and extra class licenses to help me test out. I plan on putting a digital freq counter on it. otherwise I do have a AR3500 I can purchase from a friend dirt cheap.
73 and thankyou
KC9EAE
Tom
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RE: Siltronix 1011c help
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by KC9EAE on January 18, 2005
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I have this radio on my bench hooked a meter freq counter and a dummy load. I have replaced the 8950 with a m2057. I have no problem with output. but my transmit freq doesnt seem to move more that 10kc from one end of the vfo to the other. and the band switch doesnt make a difference either. but the recieve side works fine. I have tested it with a RF generator and it tuned across the band properly.
Any clue or suggestions?
Tom Zambori
KC9EAE
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