[Hammarlund] HQ-200 Low Sensitivity
Carl
km1h at jeremy.mv.com
Thu Sep 16 10:05:47 EDT 2010
Yep, Hammarlund and National in particular are very fussy about the 6C4. Ive
found NOS JAN versions to be the best followed by GE 5 star 6135's and
regular GE and Sylvania.
The HQ-200 is on par with a NC-190, nothing special but adequate sensitivity
for non serious listening. Mine had very little use when I purchased it
several years ago and the bandswitch took a lot of patient cleaning to get
it reliable, sensitivity would come and go. The included factory manual is
marked 1st Version November 1968 so its of no help to the question.
Carl
KM1H
----- Original Message -----
From: "Singley, Rodger" <rbsingl at ilstu.edu>
To: "Bill Stewart" <cwopr at embarqmail.com>; "hammarlund"
<hammarlund at mailman.qth.net>
Sent: Thursday, September 16, 2010 9:27 AM
Subject: Re: [Hammarlund] HQ-200 Low Sensitivity
Bill,
The first thing to suspect on any of the Hammarlund HQ series with a 6C4 HFO
is the tube. You may need to try several to find one that works well in the
receiver and putting in a brand new tube is no guarantee that this is the
"best" tube for the receiver. Low HFO injection will greatly reduce mixer
gain and typically problems with the 6C4 are more prevalent as the frequency
increases. The 6BE6 may also be contributing to the problem but the 6C4 is
always a prime suspect in Hammarlund receivers. Your HQ-100 may have the
same problem.
Rodger WQ9E
-----Original Message-----
From: hammarlund-bounces at mailman.qth.net on behalf of Bill Stewart
Sent: Thu 9/16/2010 7:54 AM
To: hammarlund
Subject: [Hammarlund] HQ-200 Low Sensitivity
I recently acquired an HQ-200, which is sensitive on all bands except the
10-30 mhz range. For example, WWV is S-9 at 10 mhz on the 4-10 mhz range but
only about S-3 at 10 mhz on the 10-30 mhz range. It is more sensitive in the
mid-range area, say 12-21 mhz, with some SWBC stns reading well over S-9.
Generally, the sensitivity seems to be real low at both ends of the 10-30
range. The 20BS range seems to be fairly sensitive. I have gone thru the
alignment and only minor adjustments were needed for peak readings. The IF
is on the high side per the aux. rcvr. A while back I had a similar problem
with a HQ-100, which we discussed here...but in that case I temporarily
shelved it due to a stuck slug. It also had low sensitivity on the 10-30 mhz
range. Is this normal for the HQ-200/100 rcvrs. Is anyone using a HQ-200 and
can tell me how the sensitivity is on the 10-30 range?
I also noticed, that there are some differences in my rcvr from the BAMA
schematic (the BAMA info is issue 1 of the manual). A couple noticed are
tandem pots on the sensitivity control and a piece of coax going from the
ant. trimmer capacitor to the main tuning capacitor. These two items don't
show up on the BAMA pix. Does anyone have a schematic they could send me
that would fit my rcvr (s/n 36031666).
Any help would be greatly appreciated. Thanks..73 de Bill K4JYS
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