H.B. AM Filter... Check out Internation Radio Website for Heathkit Crystal Filters plus others

[Fred Finster]

Eddie,  Here is International Radio  Crystal Filters website and
information.
Maybe it would be worth a call to him about your need for the wide AM
crystal filter
for your Heathkit SB-301.

Fred Finster  WB7ODY
I grew up in the Roseburg Oregon area which is about 35-40 miles away from
Umpqua Oregon

http://www.qth.com/inrad/

1-541-459-5623
HOURS: 9 AM to 1 PM Pacific time (16-20 GMT), Tuesday through Saturday **

FAX
1-541-459-5632 Mail
International Radio
13620 Tyee Road
Umpqua, OR 97486

Heath: All HF Models Reference
2701L
2702L
2708
2709
Filter Fits By:
Drop In
Drop In
Drop In
Drop In
Bandwidth at 6dB
250
400
1800
2100
Mode
CW
CW
SSB
SSB
Center Freq. KHz
3395.4
3395.4
3395.0
3395.0
PRICE
$100
$100
$100
$100
Notes:
1. Specify model of radio when ordering.
2. Late models (8830 kHz IF) see Kenwood filter tables.
Specifications:
1. Ultimate rejection: > 80 dB
2. Ripple: < 2 dB
3. Typical insertion loss: 250 Hz: < 9 dB; 500 Hz: < 7 dB; SSB/AM: < 6 dB
4. Zin/Zout: 2000 ohms
Physical:
57 x 24 x 25 mm



> -----Original Message-----
> From: Heathkit Owners and Collectors List
> [mailto:HEATH at LISTSERV.TEMPE.GOV]On Behalf Of Edward Swynar VE3CUI
> Sent: Sunday, January 02, 2000 7:02 AM
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: H.B. AM Filter...
>
>
> Well, I came, I saw...I got conquered! The experiment with a homebrewed,
> wider AM filter for my SB-301 is a FAILURE!
>
> I initially tried a design with a single IF transformer on the input side
> of the pair of crystals, and then TWO transformers (both ahead of, and
> behind, the crystals)---in both instances, the sensitivity of the rig went
> WAY down...
>
> The proof of the pudding, though, was listening on the 15-MHz BC band: the
> strongest AM BC signals practically blotted out the whole range of the
> tuning dial! For a second or two, it reminded me of my regenerative
> receiver...
>
> I guess I'll just be on the look-out now for one of those rare SB-310 AM
> filters---anyone want to buy a pair of nearly-new, custom cut crystals
> appropriately spaced from the IF from me to help with the downpayment,
> should I find one...?! Hi Hi.
>
> ~73~ Eddy VE3CUI - VE3XZ
>
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