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Author Topic: HW-16 i.f. Filter  (Read 3097 times)

KD8IIC

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HW-16 i.f. Filter
« on: February 11, 2017, 12:11:53 AM »

  Hello Forum; I've seen an instance recently where someone has installed an i.f. filter in his Heath HW-16.
                   I'd be interested in doing the same to tighten up the barn door hinges on mine.  :D
                  TNX es VY 73 lane
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KA4LFP

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RE: HW-16 i.f. Filter
« Reply #1 on: March 27, 2017, 08:08:29 PM »

Sorry this is getting answered so late -- you may have given up by now.

However, the place to ask this question is on the HW-16 Yahoo group.
There are several people over there (Ken W7EKB comes to mind) who have practically re-engineered that rig.

I think the link below will work - if not, groups.yahoo.com and then search for HW16-Heathkit-HW-16

The name is long because they abandoned an earlier group for spaming. Don't get confused and join the wrong group!  ;D

See https://groups.yahoo.com/neo/groups/HW16-Heathkit-HW-16
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KD8IIC

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RE: HW-16 i.f. Filter
« Reply #2 on: March 28, 2017, 12:14:17 AM »

  Thank You...
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AH7I

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RE: HW-16 i.f. Filter
« Reply #3 on: March 28, 2017, 01:19:22 PM »

The HW-16 has a 2-pole crystal filter. The CW filter from HW/SB-X0X line will work. HW-16 BFO frequency will need a little adjustment if you don't have the crystal from the HW/SB-X0X. Make sure the filter you install works before going through the trouble. You won't get as much signal through as with the original and the HW-16 is already a little weak on 15m receive. Couple the filter with some .05 or so caps. Drill some small holes and it mounts on the chassis between the dial and the printed circuit board. I'm not sure I like the 4 pole as much as the 2 pole that's original. In hindsight, I should have added a switch, a variable frequency BFO, and maybe a solid state gain stage before or after the filter. If I ever get around to putting it back on the bench, it will get an adjustable load control and if I can find a crystal...20 meters instead of 15.
 73, -Bob ah7i/w4
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N3QE

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RE: HW-16 i.f. Filter
« Reply #4 on: March 29, 2017, 09:56:05 AM »

I'm not sure I like the 4 pole as much as the 2 pole that's original.

I really like sound the 2-pole CW-bandwidth filter. Obviously it's tough to use in a big contest, but for everyday use it's such a joy.
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AC6AN

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RE: HW-16 i.f. Filter
« Reply #5 on: March 29, 2017, 04:38:45 PM »

No need to cannibalize HW/SB rigs.
The IF freq 3395 coincides (maybe by design) with the Kenwood TS520 IF frequency, so you could possibly incorporate better filters from Kenwood or InRad.
Interesting to find that Heathkit also chose 8.830 IF for their HW-9... another Kenwood copy...
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