[Hammarlund] HQ-200 Low Sensitivity

[Bill Stewart]

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