[Kenwood] TR-7730 TX off freq.

[fredv]

Hi Ed

That is a lot of decimal places.
With my present lack of a counter, I am exploring
the possibility of using the local repeater's fancy
features.
One is called "frequency test". I suppose it measures
my frequency.
Now I have to figure out how to use it!

Fred
N1DEC

----- Original Message -----
From: <ma.locksmith@juno.com>
To: <fredvp@snet.net>
Sent: Saturday, August 10, 2002 10:44 AM
Subject: Re: [Kenwood] TR-7730 TX off freq.


> Continuing....
>
> I just realized that I had made some "obvious" simplifications, which
> might not be so obvious to others.
>
> You cannot measure the frequency of the 46.1666 oscillator and set it
to
> exactly that number.  That's because the required frequency is not
> exactly 46.1666 MHz.  The actual frequency needed is 138.5 divided by
> three or 46.1666666667.  You can't get this accuracy with most
> measurement devices.
>
> The way to set the transmit frequency, is to measure the transmit
> frequency, right at the output (through an attenuator, of course) and
> adjust the trimmer for the 46.1666 crystal to set the output within 25
> Hz.
>
> Ed
>
> On Fri, 9 Aug 2002 19:30:39 -0400 "fredv" <fredvp@snet.net> writes:
> > Hi Ed
> >
> > But anyway, I looked at the circuit and I see only two
> > crystals with trimmers. A 42.6mhz Rx and a 46.1666mhz Tx in the
> > PLL section.
>
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