At 11:14 AM 04/23/07, you wrote:
>I have some spectra-TAC micor receivers, they are the 403-512 bandsplit.
>
>Has anyone put them on 420 or 433 with much problem? Are they REALLY
>403-512? :)
>
>Thanks,
>
>Jordan
Micor receiver boards came in 406-420 MHz, 450-470 MHz, 470-494 MHz
and 494-512 MHz
Sorry, but while the chassis may be UHF, the receiver
boards come in four flavors: 403-420, 450-470,
470-494, 494-512. They're all wide-band (5 kHz). The
450-470 MHz receivers can be coaxed down into the 440
MHz band by padding a few key spots. Look at the part
number stamped on the receiver board.
Bob,
Can you elaborate on where the "padding" needs to be added? I'm using 2 UHF
(450) boards which have been tuned to 449... One works just fine, but the
other needs some help. I know it's not all that far out-of-range, but maybe
this one that is troublesome is being finicky.
Also - Jordan, i
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 pa
Well, I just read through the article at
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
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
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/cali
: RE: [Repeater-Builder] Micor RX frequency ranges?
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
No problem, Larry. I guess maybe they could have screwed up the element
when I sent it in for conversion, but I've never had a problem with ICM
before. I go back to my original query - I wonder if I should go ahead with
the cap replacement procedure and see if that gains me some sensitivity.
Since the caps are in the multiplier section, I doubt
you'll gain sensitivity by replacing them. You should
have run out of tuning range on the multipliers L101,
L102, L103, and if so, do the caps. The front end
should still be tuning OK; if you can peak the signal
and still have some adjustment on
Well, I was using the meter within the receiver shelf while I was performing
the tune-up... but it's been so long ago, I don't remember the exact
readings. I guess the next time I go to the tower site, I could run through
the meter switch settings and write them all down...
I don't remember the t
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