HW-101 - Putting it on Three Megs!/Putting SB line on otherfrequencies....

[Edward Swynar (VE3 CUI)]

Hi, fellas...

Rather than cobble-up the innards of our precious green machines, why not
simply build an external converter for 'em...?

Case in point: May 1969 QST (pp. 46-47) has an absolutely delicious circuit
for rigs like the SB-300 to receive 160-meters. It wouldn't take much to
make this gadget receive ANY 500-KHz wide band of frequencies in the HF
spectrum...

The L/C parameters in this particular circuit tune just above the BC band,
to around 5 MHz---but, armed with an ARRL Lightning Calculator, ANYTHING is
possible. Best of all, one can rob the power requirements for the converter
right off the accessory jack at the rear of the '300!

Now, if only someone had a small. junque box enclosure that physically
matched the SB-style case, but in miniature...a bit of matching Heath green
paint, & the combo would truly be a thing of absolute beauty...!

73, de Eddy VE3CUI - VE3XZ


----------
> From: Dan Ferguson <df at MNSINC.COM>
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: Re: HW-101 - Putting it on Three Megs!/Putting SB line on
otherfrequencies....
> Date: December 9, 1998 2:16 PM
>
> I built an SB-310 in 1968.  I had crystals for a number of bands other
than
> the standard bands that came with it.
>
> I covered 3000-3500 kHz and was even able to tune stations on 3395 kHz
(an
> Ecuadorian, I think it was) and 3396 kHz (an African I liked to listen
to),
> even though the IF was 3395.
>
> I covered 4600-5100 kHz for the 60 meter tropical band.  Didn't do too
well
> at 5050, where the LMO and the tuning range crossed <grin>, but I could
> easily tune Lome on 5047 kHz.
>
> I also has a switch inside on the chassis to switch the AM/SSB filters
> independently of the mode.
>
>
> Now clearly what folks need to do is sell me their SB-310s and buy
SB-301s.
>
> Dan  K4VOA
>
>
> At 07:39 12/9/98 -0800, Guy G. Giacopuzzi DDS wrote:
> >Paul K. Dean wrote:
> >>
> >> I did a very similar thing some years ago with an SB-310 receiver.
Wanted
> >> to change the 26.9 mhz "CB" band to 10 meter coverage.  Calculated the
> >> proper crystal frequency, ordered it from International Crystal.
Installed
> >> and went through the alignemnt for that band.  Bingo!  10 meter
reception!
> >
> >I own a rather special SB-310--it was built,and used by Radio Free
> >Europe...in the manual, they added instructions concerning changing the
> >310's frequency to other non-covered bands--you essentially plugged in a
> >xtal, and realined the coils...my unit even came with about 6 extra "out
> >of band" xtals.  Evidentally, RFE used the unit to monitor other
> >shortwave stations and East block jammers.  I haven't tried my unit on
> >such frequencies, but, from what I can gather, the tuned circuts have a
> >greater range than one would suspect.  This makes a 300/301/310 a rather
> >versatile receiver, especially since you get 500kc of range on each
> >band; a Collins 753C will only give you 200kc per xtal.  This won't work
> >with an SB-303--changing the xtals and getting to the coils is too
> >difficult, but it's relatively easy for the 300/301/310 because of the
> >flip top lid and easy access to the coil bank. So all you fellows
> >bemoaning the fact you can't get a 310', relax, just convert a 300/301!
> >
> >ggg
> >
> >--- --- --- --- --- --- --- --- --- --- --- --- --- --
>
>
> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
> + Dan Ferguson           K4VOA          Northern Virginia
> + df at mnsinc.com
> +
> + Wanted:
> + HEATH SB310/SB620 (wired for 3395 kHz)
>
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