In Kevin's article he gives the metering test point readings
for the local oscillator/multipler chain.. If you measure
your board you just might find a low reading somewhere....
and low injection = low receive sensitivity.
At 05:23 PM 04/25/07, you wrote:
Larry,
The element was
re-rocked/calibrated/compensated/etc by
ICM
This is why I was wondering if it might be
worth the effort to do the cap change to the receiver board.
Mark N9WYS
From: Repeater-Builder@yahoogroups.com On Behalf Of larryjspammenot
Who did you order the crystal from? I had a
Canadian company recrystal my KXN1024A UHF MICOR
receiver channel element for a 447 MHz
frequency, and the companion KXN1052 MICOR
transmitter channel element for a 442 MHz
frequency. I never could get real good
sensitivity out of the receiver, and the
transmitter would not deviate more than about 2 kHz.
I then sent the elements to International
Crystals, and had them make a new set of
crystals for the same pair of frequencies. Then,
the receiver tuned right up with excellent
sensitivity, and the transmitter had lots of
deviation (well over +/- 5 kHz, if I needed it.)
They're still in use and working great.
LJ
-----Original Message-----
From: N9WYS
Well, I just read through the article at
<http://www.repeater-builder.com/rbtip/uhfsensitronRX.html>http://www.repeater-builder.com/rbtip/uhfsensitronRX.html
and it says that this mod is not necessary if the freq being received is
above 445 MHz... My RX freq is 449.550, but I cant get the current
receiver sensitivity to tune any better than .6µV for 12dB SINAD.
I'm wondering if this mod will help even though the receiver is operating
close to factory specs, or if I should just chuck this receiver board in the
crapper in favor of a better one, or... Any ideas?
Mark - N9WYS
-----Original Message-----
From:
<mailto:Repeater-Builder%40yahoogroups.com>Repeater-Builder@yahoogroups.com
On Behalf Of Bob M.
Actually Dave, N1OFJ, who peruses this group, modified
his receiver to go down to 444.475 MHz, following info
he got from Kevin W3KKC. I suspect that info is on the
repeater-builder site in the Motorola/Micor area, but
if not, Kevin was the original source. It's the
crystal multipliers that need padding, and not by
much, perhaps 3-9pf.
Bob M.
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