[AMRadio] 10M AM Frequencies

Thu Sep 29 21:39:12 EDT 2011

Hi Eddy,

I haven't looked too hard for a 310 or the AM filter for it but haven't run
across one that was cheap.

As a note on the SB 300 I added additional coupling capacitors in the audio
circuit and greatly improved the low frequency response. The better low
frequency response lets a little more adjacent channel crud in on SSB but is
much more pleasant to listen to.
 All the heath receivers lack good low frequency response as they are.

73
Gary  K4FMX

> -----Original Message-----
> From: Eddy Swynar [mailto:deswynar at xplornet.ca]
> Sent: Thursday, September 29, 2011 4:16 PM
> To: Gary Schafer
> Cc: Discussion of AM Radio in the Amateur Service
> Subject: Re: [AMRadio] 10M AM Frequencies
> 
> Hi Again Gary,
> 
> Now THIS was a deal:
> 
> http://www.ebay.com/itm/HEATHKIT-SB310-
> /180725161171?pt=LH_DefaultDomain_0&hash=item2a140f1cd3#ht_500wt_1413
> 
> For eighty bux you coulda gotten the whole enchilada, filter included! I
> recall not too many years ago when the AM filter in these things ALONE
> went for that kinda $$$...
> 
> On the other hand, THIS is more like it:
> 
> http://www.ebay.com/itm/HeathKIT-SB-310-SHORTWAVE-RECEIVER-Refurbished-
> NICE-
> /120776033939?pt=LH_DefaultDomain_0&hash=item1c1ed00693#ht_3211wt_1398
> 
> They're still out there, alright---just gotta dig a little...
> 
> ~73~ de Eddy VE3CUI - VE3XZ
> 
> 
> ************************************************************************
> ********************************************
> 
> 
> 
> 
> 
> On 2011-09-29, at 1:00 PM, Eddy Swynar wrote:
> 
> > 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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