Doesn't seem very practical to me Robert unless you're
really restricted for space. I have not confirmed the LO
injection side of the Mitrek Low band layout, but for the
example I'll assume you're right about the ~62MHz value.
I would assume the mitrek channel element would be looking
to deliver it's output into some fairly high Q - possibly
resonant buffer circuits so your load might be excessive.
You didn't mention if you re-rocked the element yourself.
The first trick would be to try the new rock in a working
mitrek, then try to move the known working element into
your revised circuit.
Also keep in mind that some Motorola receiver elements have
an AFC input pin, which may require a dc bias.
So a tank circuit is probably required... when you finish
the project is the end result going to be smaller than the
original parts?
cheers,
skipp
> "ve3iny" <[EMAIL PROTECTED]> wrote:
>
> I am currently running a 6 meter repeater using a Midland 70-055C
> transceiver as a receiver.
>
> Anyone familiar with this transceiver will know that the receiver
> requires a LO signal (approx 62 mhz) from the main VCO. The main
> VCO is located on the transmitter board (which is fairly large
> board in comparison to the receiver board).
>
> I would like to eliminate the neccesity of have to use the
> transmitter board altogether, and need to come up with a
> simple crystal oscillator circuit to generate the 62 mhz LO.
>
> It just so happens that a Motorola Mitrek VHF receive channel
> element will work within the 62 mhz range. So I have decided
> simply to install my LO crystal inside the element, and connect
> the output of the element directly to the Midland receiver
> board (eliminating the need for the transmitter board).
>
> But I can't seem to make the Mitrek channel element to work "stand-
> alone". I've gounded Pin 1, and applied 9 volts to Pin 3, and I've
> brought Pin 4 low (ground)to enable the element. But with a scope
> connected to Pin 2, I see no output ?
>
> Can anyone shed light onto this for me ? Do I need to add a tank
> circuit at Pin 2 ? Or do I have the pin-out all wrong ? Is there some
> secret I'm missing ?
>
> I've tried multiple elements (just in case I had a defective one) to no
> avail.
>
> Thanks in advance ...
>
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