[Hammarlund] HQ-170(?)

[Glen Zook]

The "C" stands for "clock" and any paper capacitors
should be changed out with "orange drops" or similar
more modern capacitors.  This is true for any "boat
anchor" equipment since paper capacitors are problems
that are just waiting to happen!

The HQ-170C is an HQ-170 with the clock-timer.

The HQ-170AC is an HQ-170A with the clock-timer.

>From what my reference material tells me (and it is
pretty brief), the main differences between the HQ-170
and HQ-170A were the addition of a dial scale to add 2
meter calibration (uses the same divisions as the 6
meter) and the addition of a power socket to control a
2 meter converter (used 50 MHz as the i.f.).

There also was the HQ-170A-VHF which came with the 2
meter converter installed and a nuivistor preamp for 6
and 2 meters.

By the time you get to 6 meters, the frequency
stability of the receiver is not that good.  It is OK
for AM, but not for SSB.  However, when the receivers
were designed, AM was "THE" mode on 6 and 2 meters,
not SSB.  They have adequate stability for AM.  The
stability of many of the HQ-170 series (and the HQ-110
as well) are marginal on 10 and 15 meters when it
comes to SSB.  On 20 meters and lower frequencies they
work pretty well for SSB.  Of course, there definitely
are exceptions and you can find a particular receiver
that is pretty stable.  However, in general, they are
pretty "drifty" on the higher bands.

Glen, K9STH


--- N4ue@aol.com wrote:

Although I have had a few HQs that I temporary custody
of, I now have an HQ-170A on it's way.  I cannot seem
to find out what the differences are between the:

170A
170AC
170C
 
Does the C stand for 'clock'??? It appears the A has a
clock also.

Also, do these old girs need the tubular caps
replaced? 

=====
Glen, K9STH

Web sites

http://home.attbi.com/~k9sth
http://home.attbi.com/~zcomco

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