I ordered just the xtals from them. One the UHF version, the crystals that I
had tuned them up are at 434.850, was neither high or low side injection. The
xtal that I put in this radio is at 434.875 Mhz with a high side injection.
Could it be that far off.
Mathew
Eric Lemmon <[EMAIL PROTECTED]> wrote:
Mathew,
Did you order just bare crystals to put in some existing channel elements,
or did you send the elements to Bomar and have them compensated with the new
crystals? That may be part of the problem, but usually the lack of
compensation doesn't prevent the crystal from operating- it just might allow
them to drift more than the specified tolerance.
Since the Exec II radio has tuning adjustments in both the
oscillator-multiplier and the RF assembly, the non-operation may be nothing
more than a lack of tuning. If the previous frequencies are far removed
from the new frequencies, the tuning may be so far off that the oscillator
is not even working. What channel frequencies were used previously?
It may be that some components may need to be changed to optimize the radios
for out-of-band operation.
73, Eric Lemmon WB6FLY
-----Original Message-----
From: Repeater-Builder@yahoogroups.com
[mailto:[EMAIL PROTECTED] On Behalf Of Mathew Quaife
Sent: Monday, January 01, 2007 9:09 AM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Bowmar Crystals Ordered, all the RX not
working for GE EXEC II mobiles
Thanks Chuck, found them in the list that was referenced. So these are
correct, why do they not work? Anyone with any good ideas?
Mathew
Chuck Kelsey <[EMAIL PROTECTED]> wrote:
For high side, high band -- F+11.2/9
For high side, UHF -- F+11.2/27
Chuck
WB2EDV
----- Original Message -----
From: Mathew Quaife <mailto:[EMAIL PROTECTED]>
To: Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder@yahoogroups.com>
Sent: Monday, January 01, 2007 11:44 AM
Subject: Re: [Repeater-Builder] Bowmar Crystals Ordered, all
the RX not working for GE EXEC II mobiles
Thanks Chuck, that is what they sent me, so your math is
just fine. Then there must be something I am missing. I can take one of
the old xtals and they work out just fine, so I know the receivers are
working. Might I ask what the formula you used was? It's been a long time
since I have calculated a crystal freq. so just need the formula
configuration.
Mathew
Chuck Kelsey <[EMAIL PROTECTED]> wrote:
If my hasty math is correct:
144.81 low side = 14.845555
144.81 high side = 17.334444
434.875 low side = 16.39537
434.875 high side = 16.521296
Chuck
WB2EDV
----- Original Message -----
From: "n9lv" <[EMAIL PROTECTED]
<mailto:n9lv%40yahoo.com> >
To: <Repeater-Builder@yahoogroups.com
<mailto:Repeater-Builder%40yahoogroups.com> >
Sent: Monday, January 01, 2007 10:40 AM
Subject: [Repeater-Builder] Bowmar Crystals Ordered,
all the RX not working
for GE EXEC II mobiles
> Hope someone can help shed some light here. I
ordered xtals from
> Bomar (3 week wait) for the GE EXEC II mobile
radios, 6 for RX for
> 144.810 and one RX of 434.875, all high side
injection. None of them
> are working at all. At the same time I ordered tx
xtals for the same
> radio, they all work just fine. What might I be
missing here, or did
> they just cut them all wrong.
>
> Mathew
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