[HomeBrew] Re: 2 & 6 Meter Recever Kit

[Barry Sherwood]

I've got to hand it to you folks on this list you all
have rose to the occassion and been very helpful! And
Steven I have several of those baby monitors in the
junk box now where did I put that box?

Thanks
Barry, KF5GC

--- Steven Coles <scoles at isomedia.com> wrote:

> While I knew patching into an AM IF should work, I
> didn't know how well.  So. . . I decanted a
> 49.860-MHz baby monitor receiver to get at the
> MC3361 (a more modest member of the same family as
> the MC3362).  For the AM IF amplifier I opened a
> Radio Shack 12-889 AM/FM/Weather Radio.  The first
> step was tying the grounds together.  After removing
> the 455 ceramic filter from the baby monitor, I
> patched the monitor's second converter output into
> 12-889's 455-kHz filter input.  All unnecessary
> shunting impedances had to be disconnected.

> A toy walkie-talkie supplied 49.860-MHz AM source. 
> The method provides enough gain to get feedback with
> the walkie-talkie about 15 feet distant from the
> receiver.  If I changed one of the baby monitor
> local oscillator crystals to 39.7 MHz and tuned the
> input coil slug, I could monitor local 50.4-MHz AM
> activity.

> Now let's see. . . add a BFO and. . .

> 73,

> Steven


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