Scans VHF but not UHF Freqs
 

Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?

"Doc" wrote in news:1121496726.529790.93690
@g43g2000cwa.googlegroups.com:

Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?

Are you saying you can set the squelch wide open in UHF, but it keeps right
on scanning ?

What model scanner? Maybe the scanner can only scan in one specific band at
a time by design.


"Doc" wrote in message
ups.com...
Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?

Possibly some one attempted a cellular mod, and botched it?

Bill Crocker


"Doc" wrote in message
ups.com...
Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?

On 15 Jul 2005, Doc wrote:

Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?


5 possible reasons:

1) The squelch is not set properly.

2) One or more of the UHF frequencies you expect to pick up is out of
the frequency range of the scanner, or the scanner skips over the
frequency or freqs you expect to pick up, because of the step size and
where each step lands on, etc.

3) You are using an antenna unsuited to some of the frequencies you wish
to pick up.

4) UHF stations in your area are, by sheer "fluke" or coincidence, too far
away and/or the signals are too weak; or you do not have close enough to
line of sight conditions to pick up these stations.

5) Your antenna is somewhat directionally sensitive and this happens, by
sheer "fluke" (see above) to make picking up UHF stations in your area
more difficult than would be otherwise.

You haven't been very specific with your question. Is this a problem you
have actually had with your scanner, or is this a "hypothetical"
question? What is the make and model of your scanner? What are the
frequency ranges that it covers, and how big are the steps in each range?
What is the size, type, and configuration of your antenna? Are you sure
that moving from VHF to UHF scanning is the problem, and what makes you so
sure of this? Do you even have a scanner? Have you done some basic
things to improve your scanner's performance (if these are possible in
your case) such as rig up a smooth power supply to filter out noise, 60
cycle hum, etc. and/or ground your antenna?

#6 The frontend of the receiver is broke

"Ian W. Douglas" wrote in message
...


On 15 Jul 2005, Doc wrote:

Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?


5 possible reasons:

1) The squelch is not set properly.

2) One or more of the UHF frequencies you expect to pick up is out of
the frequency range of the scanner, or the scanner skips over the
frequency or freqs you expect to pick up, because of the step size and
where each step lands on, etc.

3) You are using an antenna unsuited to some of the frequencies you wish
to pick up.

4) UHF stations in your area are, by sheer "fluke" or coincidence, too far
away and/or the signals are too weak; or you do not have close enough to
line of sight conditions to pick up these stations.

5) Your antenna is somewhat directionally sensitive and this happens, by
sheer "fluke" (see above) to make picking up UHF stations in your area
more difficult than would be otherwise.

You haven't been very specific with your question. Is this a problem you
have actually had with your scanner, or is this a "hypothetical"
question? What is the make and model of your scanner? What are the
frequency ranges that it covers, and how big are the steps in each range?
What is the size, type, and configuration of your antenna? Are you sure
that moving from VHF to UHF scanning is the problem, and what makes you so
sure of this? Do you even have a scanner? Have you done some basic
things to improve your scanner's performance (if these are possible in
your case) such as rig up a smooth power supply to filter out noise, 60
cycle hum, etc. and/or ground your antenna?

That would lock out all freqs, not just UHF freqs.

On Tue, 19 Jul 2005, Ralph wrote:

#6 The frontend of the receiver is broke

"Ian W. Douglas" wrote in message
...


On 15 Jul 2005, Doc wrote:

Why would a scanner automatically scan and stop at VHF frequences but
not UHF frequencies?