Irv,
I have the Sams, Rider and Hallicrafters manual and I am following those. The
procedures seem to be the same, except the numbering scheme for the various
adjustment points. They don't mention anything about using the logging scale and I am
not familar with that process.
I am using my Cushman 5110 service monitor, checking the freq with an HP counter
which has been compared to a GPS 10 MHz. standard, so I know that the signal I am
feeding it is good.
Thanks
Irv Finkleman wrote:
Frederick Bray wrote:
I am having some problems aligning my SX-42. I replaced all the paper
caps and a number the aged resistors that are usually found to be way
out of spec.
I find that I am having problems obtaining proper dial calibration. I
can generally set the high end of the band using the trimmer cap. But
after I set the low end by adjusting the coil, the high end is off
again. Repeated efforts don't significantly narrow the gap.
On the highest band, the problem is most pronounced. The 60 MHz low
point was dead on to start with. However the high end is 1 to 2 MHz off
and there is not enough adjustment in the trimmer cap to fix this.
I wonder whether anyone else has had this type of problem and found a
solution? I am considering doing some further re-capping, but it is my
understanding that generally this is not necessary.
The one other factor, which I have yet to fully explore, is the B+.
Apparently, at one point the power transformer was replaced and the B+
is about 30 volts higher than spec. I am going to try putting a
dropping resistor in to bring it down to the 250 volts indicated in the
manual and attempt one more alignment, starting with the IF's. I wonder
whether anyone has encountered this and whether this 10+% voltage
overage is a problem to worry about?
Many thanks in advance.
Are you following a specified alignment procedure or just going
by the old 'hi end cap, lo end coil' concept? I ask because some
alignment procedures dont go right to the high end or the low end
but to a point just inside the range, for example assume a logging
scale of zero (low end) to 100 (high end). The high end alignment
would be carried out at about 80 on the scale, the low end at 20.
If all else fails you might try something like that. Hope this helps.
--
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Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada