C. Crane Co. BC9000XLT 800 MHz Mod
Stephen Lui
to the BC9000XLT to restore full 800 MHz coverage. Does anyone have any
experience with this?
I already have a BC3000XLT and am very happy with it. The BC3000XLT
receives images of the blocked 800 MHz band from 1005 MHz and 1030 MHz.
Does the BC9000XLT have a similar "feature"?
Stephen
KF6BTE
Bob Parnass, AJ9S
Stephen Lui <l...@netcom.com> wrote:
I don't know about C. Crane, but some time ago, I modified one
of my BC9000XLTs for expanded 800 MHz coverage. I applied part of
Steve Donnell's BC8500XLT modification to my BC9000XLT. The
adaptation is cheap, and requires only one part -- a switch.
I posted something about this, using the term "image swap",
a few months ago but nobody responded.
I drilled a 1/4" hole on the rear panel and mounted a DPDT toggle
switch (available from Radio Shack). The switch reverses the logic
level signaling leads which control the front end band filters,
switching *in* the 800 MHz filter and switching *out* the
filter for the upper end of the military air band.
Then you get *full* 800 MHz sensitivity when tuning the 360 - 380 MHz
range image. I made 12 dB SINAD sensitivity measurements to confirm.
Bottom line -- the 800 MHz image and mil air signals are
swapped -- the mil air signals become the images. :-)
This doesn't affect the display circuitry which still reads
the mil air frequency.
Buy a BC9000XLT service manual first. The surgery is delicate
due to cutting small traces on the printed circuit board and
routing the wires from the switch to their proper destinations.
--
==============================================================================
Copyright 1996, Bob Parnass, AJ9S par...@lucent.com
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Business Resource Group
>
> Bill Crocker <bi...@mail.rust.net> wrote:
> >
> > Stephen:
> >
> > You should find Cellular frequency images between 985.1600 - 1010.0000MHz. on
> > the Uniden BC9000-XLT scanner.
> >
> > Bill Crocker
> >
> > p.s. It is illegal to monitor such frequencies, however, it is allowed for
> > testing purposes.
>
> Legality aside, I have yet to hear a single cellular signal on
> my 9000. I've tried everywhere including the range mentioned above on
> a Cellular Security Group 800 meg antenna mounted 35 feet up and get absolutely Zilch.
> It's a *great* scanner otherwise but If the cellular stuff is
> important to you, better hang on to another scanner that'll pick 'em
> up!
>
> Regards, swami @;<} tommy
It has been my experience that the 9000xlt has cell images in the high
300 MHz range...I get them with no problem. Give it a try!
Regards,
DOUG
Gary Wilburn
are in NFM mode and your step rate is 5 khz's. Now you are scanning at
close to 300 channels per second ! This does not seem to be an image
frequency but appears to be a software glitch in the 9000. The
tests I have done with a dicone antenna at 70 ft and a 20 db pre amp
show that the signal strength between an un-blocked R7100, PRO 2006 and
the BC 9000 receiving at 360-385 NFM are similar. The BC9000 will
receive all the local Cell sites very well even with the basic antenna
that came with the radio and appears to pick up 90 % of what the other
radio's will receive on distant cell sites.
If you want to test this "modification" do so on a weekday during
normal business hours. Cellular activity greatly decreases after 8 pm
and during the weekend.
Good Scanning !
Gary Wilburn
Atkins
subject which is the C. Crane Co. 800 Mod. It supposedly comes with a
video for $24.95 and a parts kit for $5.00. I know their phone number is
1-800-522-8863 but what I want to know is to hear from someone who has
done the mod and can comment on its difficulty and exactly what it involves.
Thanks,
T
Gary Wilburn (ni...@one.net) wrote:
: Scan from 360 to 385 mhz to monitor cellular frequencies. Make sure you
Tom Aldrich
>
> Scan from 360 to 385 mhz to monitor cellular frequencies. Make sure you
> are in NFM mode and your step rate is 5 khz's. Now you are scanning at
> close to 300 channels per second ! This does not seem to be an image
> frequency but appears to be a software glitch in the 9000. The
> tests I have done with a dicone antenna at 70 ft and a 20 db pre amp
> show that the signal strength between an un-blocked R7100, PRO 2006 and
> the BC 9000 receiving at 360-385 NFM are similar. The BC9000 will
> receive all the local Cell sites very well even with the basic antenna
> that came with the radio and appears to pick up 90 % of what the other
> radio's will receive on distant cell sites.
> If you want to test this "modification" do so on a weekday during
> normal business hours. Cellular activity greatly decreases after 8 pm
> and during the weekend.
>
> Good Scanning !
>
> Gary Wilburn
Been there, Done that, no luck
@;<} swami
Tom Aldrich
>
> In <4iek8a$j...@insosf1.netins.net> Tom Aldrich <ald...@netins.net>
> writes:
> >
> >Bill Crocker <bi...@mail.rust.net> wrote:
> >>
> >> Stephen:
> >>
> >> You should find Cellular frequency images between 985.1600 -
> 1010.0000MHz. on
> >> the Uniden BC9000-XLT scanner.
> >>
> >> Bill Crocker
> >>
> >> p.s. It is illegal to monitor such frequencies, however, it is
> allowed for
> >> testing purposes.
> >
> >
> >
> >
> > Legality aside, I have yet to hear a single cellular signal on
> >my 9000. I've tried everywhere including the range mentioned above on
> >a Cellular Security Group 800 meg antenna mounted 35 feet up and get
> absolutely Zilch.
> > It's a *great* scanner otherwise but If the cellular stuff is
> >important to you, better hang on to another scanner that'll pick 'em
> >up!
> >
> > Regards, swami @;<} tommy
>
>
> kinds of cellular images there. Also plenty of cabs below there.
> The 9000 is a great scanner but if you are into military air you will
> run into these images.
>
> Fred L.
Been there, done that......zilch. Thanks anyway Fred
@;<} swami