Hi Brian,
Thanks for your suggestion. But that was one of the first things I tried and
it left one RF coil unwired.
Anyway, I have been plugging away and I think I have it wired correctly...at
least it seems to work well wired this way. I am redrawing tyhe schematic
for the SX-25 to incorporate the two coils and if anyone is interested drop
me an SASE at my QRZ.COM address.
Keep 'em glowing!
W9STB
"Brian Hill" wrote in message ...
"Smokey" wrote in message
m...
Hello Glowguys,
I am working on a Hallicrafters SX-25 that has a specific li'l nuance
(or better described, NUISANCE) and I am hoping someone out there can
help me.
The SX-25 has TWO RF COILS for the standard broadcast band (Band 1)
preceeding the First Detector/Mixer/HF Oscillator. Both of these coils
were disconnected prior to my obtaining the rig for some unknown reason
(the coils are fine, I've got continuity through the primary and
secondary of each). HOWEVER I also own two other SX-25s and when I
compare this one to those I find the other ones only have ONE RF COIL
ahead of the First Detector/Mixer/HF Oscillator for Band 1.
H-m-m-m-m.
One suggestion I received was that the circuit of the early run SX-25s
was very similar to that of the SX-17, so I compared the SX-17 to the '25
however it shows the antenna jacks connected directly to the 1st
Detector/Mixer and completely bypassing the RF AMP stages on its Band 1
(standard broadcast band).
My Band 1 is dead but I have goot perfecormance now on Bands 2, 3 and
even pretty good performance on 4.
Does anyone have an early run SX-25 and can tell me how these coils are
wired? I've experiemented with a lot of logical combinations I thought
might be possible but none seem to bring in the ball game and
neo-conservative dingbat talk shows for me.
Every schematic I have ever seen for the SX-25 (including those on BAMA
and the originals I own) show only one RF coil in use for the the
standard broadcast band, so if you've got an earlier schematic I WILL PAY
MOOLAH for it.
Thanks for any help you can toss my way.
W9STB
Hi Vern,
Have you tried wiring it like the schematic you have?
--
Regards
B.H.
Hill Amplification
http://hillamplification.com
Brian's Radio Universe
http://webpages.charter.net/brianhill/500.htm