[Boatanchors] HRO 60 alignment problem.... solved
Bill Cromwell
wrcromwell at gmail.com
Tue Oct 8 08:46:21 EDT 2019
Hi Pete,
It is possible that inductor was installed at the factory. I have some
personal experiences and records of other assembly errors and some of
them seem just incredible. If the previous users didn't use that band(s)
It would go unnoticed until you tried to use it.
There are hams who rarely to never get on frequencies higher that the
forty meter band. I have been on those higher frequencies only enough
that I can't say "never".
73,
Bill KU8H
On 10/7/19 10:38 PM, Pete Williams wrote:
> .....checking the alignment of some coil boxes.. I found the GC on
> a 14 - 30 MHz box A---- I have 2 if them-- must have a problem in
> the oscillator box #4. There was no way the frequency would move
> high enough to enable the WWV on 15 Mhz to tune to the
> injection freq of around 17 MHz.
> My other box A was fine and even exchanging the osc. box 4
> proved the original diagnosis justified.
> I should add that it was possible to monitor the injection frequency
> with the simple expedient of connecting my freq counter via a X 10
> probe to the osc trimmer... the frequency not that accurate as
> capacitance in the probe lowered freq but gave a ball park figure that
> could be corrected when the fault found and fixed.
> So dismantling and comparing both coil box #4 revealed the
> truth.....all components compared similar xcept the coil on the
> suspect box had 4 turns instead of the 3 turns on the working one.
> Further investigation showed the part number stamped on the coil
> former and checked with the parts list showed it was for a coil box
> B - 7-14 MHz ! !
> With nothing to lose,a turn was removed at the end furtherest from the
> tapped connection, reassembled. and now had no trouble getting
> injection correct and a functioning unit.
> Why some previous user made the change is unknown.
> Cheers
>
> Pete VK3IZ
--
bark less - wag more
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