In article ,
"Joe L." wrote:

Hello. I've been restoring a Hammarlund HQ-145 that has been neglected
for many years. After performing the RF alignment, I noticed that the
sensitivity at 10 Mc on the 10-30 Mc range is about 10 dB worse than
when tuned to 10 Mc on the 4-10 Mc range. This was even after adjusting
the 10-30 Mc ANT and RF coils as instructed by the manual.

The sensitivity is actually much better at 30 Mc than it is at 10 Mc on
that band setting. I wonder if this was a design compromise? Or is there
still something flaky with my HQ-145?

I would appreciate it if someone else with a working HQ-145 would please
check whether theirs operates the same way. Just tune into WWV at 10 Mc
on both band settings and see if there's much difference in signal
strength. Thanks!

Tnx,
Joe K9LY

Worse here on a working 145A. WWV 20-40db over 9 on the 4-10 range.
S3-S5 on the 10-30 range. Seems more sensitive at 30Mc than 10Mc here
too. However, I can't vouch for the alignment that a friend did 6 years
ago for me.

Please keep us posted.

Best,
Mike KM6WB

On Apr 22, 1:40*pm, Mike wrote:
In article ,
*"Joe L." wrote:





Hello. I've been restoring a Hammarlund HQ-145 that has been neglected
for many years. After performing the RF alignment, I noticed that the
sensitivity at 10 Mc on the 10-30 Mc range is about 10 dB worse than
when tuned to 10 Mc on the 4-10 Mc range. This was even after adjusting
the 10-30 Mc ANT and RF coils as instructed by the manual.

The sensitivity is actually much better at 30 Mc than it is at 10 Mc on
that band setting. I wonder if this was a design compromise? Or is there
still something flaky with my HQ-145?

I would appreciate it if someone else with a working HQ-145 would please
check whether theirs operates the same way. Just tune into WWV at 10 Mc
on both band settings and see if there's much difference in signal
strength. Thanks!

Tnx,
Joe K9LY

Worse here on a working 145A. WWV 20-40db over 9 on the 4-10 range.
S3-S5 on the 10-30 range. Seems more sensitive at *30Mc than 10Mc here
too. However, I can't vouch for the alignment that a friend did 6 years
ago for me.

Please keep us posted.

Best,
Mike KM6WB- Hide quoted text -

- Show quoted text -

My restored and aligned HQ-160 shows the same sort of difference on
the two bands. IIRC, the oscillator injection was similar on both
bands. Sounds like this is a generic problem with Hammarlunds of this
vintage.

Neil S.

Great answers, everyone. Thank you very much for all the input. I will
probably spend more time on it this weekend, and will report my findings
here.

Tnx & 73,
Joe K9LY


In article
,
nesesu wrote:


My restored and aligned HQ-160 shows the same sort of difference on
the two bands. IIRC, the oscillator injection was similar on both
bands. Sounds like this is a generic problem with Hammarlunds of this
vintage.