[AMRadio] 10M AM Frequencies

Thu Sep 29 13:00:49 EDT 2011

Hi Gary,

I got the schematic for the HB filter from a former Heath engineer, who relayed it to me on-line---I'll have to see if I might still have it someplace, though (I built it some years ago)...!

It was based upon the extra-wide AM filter that Heath used in their SWL "SB" receiver---the SB-310...? Much better than the restricted AM filter that was optional for the '301.

Anyway, I used an old Heath SSB filter (the large size one) for the new filter's foundation, & simply replaced the crystals in it with the ones specified on the original specs. I then re-sealed the case with solder, & mounted it below the chassis because the larger physical size wasn't compatible with the mounting holes in the '301 (if I'd had an SB-300, it would have been perfect).

The crystals were purchased from JAN Crystals in Fort Meyers---the final cost was about the same as a replacement AM filter on eBay at the time.

Have you made inquiries, or shopped around for an SB-310 SWL AM filter...? I haven't bothered to look ever since I made my own here, but they DID show up fairly regularly on eBay at the time...

~73~ de Eddy VE3CUI - VE3XZ

*****************************************************************************

On 2011-09-29, at 12:42 PM, Gary Schafer wrote:

> Hi Eddy,
> 
> Interested in your home brew AM filter for the heathkit. 
> I have an SB300 with the factory AM filter but it is too narrow to be useful
> at all.
> 
> 73
> Gary  K4FMX
> 
>> -----Original Message-----
>> From: amradio-bounces at mailman.qth.net [mailto:amradio-
>> bounces at mailman.qth.net] On Behalf Of Eddy Swynar
>> Sent: Thursday, September 29, 2011 10:46 AM
>> To: Jack Dayton; Discussion of AM Radio in the Amateur Service
>> Subject: Re: [AMRadio] 10M AM Frequencies
>> 
>> Hi Guys,
>> 
>> For my money, the absolute BEST value in a vintage tube-type receiver is
>> the venerable Heathkit SB-301...
>> 
>> Those rigs are incredibly sensitive, easy as pie to work on, have 1-KHz
>> dial resolution, and are CHEAP in to-day's market...
>> 
>> Their only drawback with this rig is the LACK of an AM filter! You can
>> buy one on eBay (if you'e willing to pay the price!), or roll your own,
>> as I did here...
>> 
>> My second choice is the Drake R-4 series of receivers. Again, very
>> sensitive, easy to work on, 1-KHz dial resolution, coverage of at least
>> the first 15-KHz of the 10-meter AM window without added crystals, AND
>> they play well in the AM mode, "...right outta the box!" The early
>> models go for a tad more than the Heathkit receivers, though...the "C"
>> series for considerabley more.
>> 
>> ~73~ de Eddy VE3CUI - VE3XZ
>> 
>> 
>> *********************************************************
>> 
>> 
>> 
>> On 2011-09-29, at 9:57 AM, Jack Dayton wrote:
>> 
>>> Well if money is no object or maybe it is but Ebay has house full of
>> receivers
>>> 
>>> we all know that if it was me I'd use whatever  Rice Rig I had on hand
>> and
>>> 
>>> wait till my Gooder receiver was done and save money..No disrespect
>> meant
>>> You do what you want Another receiver,.. I Liked Lafayette Receivers
>> they
>>> work well do what you want and don't cost a mint. Realistic produced a
>> few S.S.
>>> rigs that worked well in AM.
>>> 
>>> 
>>> 73
>>> Jack
>>> KA3ZLR
>>> 
>>> 
>>> 
>>> ________________________________
>>> From: Rob Atkinson <ranchorobbo at gmail.com>
>>> To: Discussion of AM Radio in the Amateur Service
>> <amradio at mailman.qth.net>
>>> Sent: Thursday, September 29, 2011 9:12 AM
>>> Subject: Re: [AMRadio] 10M AM Frequencies
>>> 
>>> NC300
>>> 
>>> rob
>>> k5uj
>>> 
>>> On Wed, Sep 28, 2011 at 5:57 PM, Harry Petersen sr
>>> <peerlesshrp at gmail.com> wrote:
>>>> I need a good old all band receiver my Collins 75a-2 is down for
>>>> repair miss it bad.do  you know of anything even  close ?
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