Actually, I was replying to the message you chopped off the quote that talked about how he wanted a scanner that did SNFM but not trunking. Trunking is cheaper than SNFM, so any scanner that has SNFM likely will have trunking.
Joe M. ocwarren2000 wrote: > > --- In [email protected], MCH <[EMAIL PROTECTED]> wrote: > > > > Another point: The only scanners that support the new SNFM channels > are > > those that also support trunking. Most scanners support trunking > these > > days. You can get a scanner that supports SNFM and trunking for a > couple > > hundred dollars. P25 scanners cost much more. > > > > Joe M. > > > > > Paul Plack wrote: > > > > > > Dick, > > > > > > I think you missed his point. If the scanner's microprocessor > leaves > > > you tuned several Khz off-channel, making the receiver more narrow > > > would actually make the problem worse. > > > > > > 73, > > > Paul, AE4KR > > No, I didn't miss the point, it's just that others were > covering getting the microprocessor tunning on channel center, so > there was no point to my adding to that "pile"!! > > So, I commented on narrowing the receiver responce accordingly so > as to eliminate the noise, etc., that would result from a narrow band > signal in a wide band radio... > > First fix the channel centering, then narrowing the responce > accordingly.. one follows the other.. > > Dick > > Dick > > > > > > > > > ----- Original Message ----- > > > From: ocwarren2000 > > > To: [email protected] > > > Sent: Monday, February 18, 2008 1:43 AM > > > Subject: [Repeater-Builder] Re: Wide Band / Narrow Band > > > > > > --- In [email protected], "Jim Cicirello" > > > <ka2ajh@> > > > wrote: > > > > > > > > We are going through the same growing pains here in Rural > > > Western > > > New York. > > > > The problems with the NON-TRUNKING SCANNERS, is they will > > > not go > > > out to 12.5 > > > > KHz or even lower of a split. Here is an example; one of > > > our > > > frequencies, > > > > 155.0475. Now if you try to put that in your BC-895XLT it > > > will > > > round off. > > > > Another problem is that on the narrow band frequencies, > > > they use a > > > deviation > > > > of about 3 KHz. The scanners, even the new TRUNKING > > > SCANNERS that > > > will go > > > > out to the new narrow band frequencies will NOT > > > consistently decode > > > the > > > > lower generated PL Tones below about 4 KHz. I called > > > Uniden and > > > told them > > > > that I wanted a list of scanners that would do the new > > > narrow band > > > > frequencies BUT DID NOT NEED TRUNKING. He told me that the > > > only > > > scanners > > > > they have capable of narrow band are the TRUNKING UNITS. > > > Now if you > > > are > > > > close to the transmitter, you can sometimes hear the > > > rounded off > > > frequency > > > > OK without distortion. And if the PL don't decode, use > > > carrier > > > squelch. > > > > Hopes this helps. Join the crowd of the new Narrow Band > > > Generation. > > > > > > > > > > > > > > > > _____ > > > > > > > > From: [email protected] > > > > [mailto:[EMAIL PROTECTED] On Behalf Of > > > rrath@ > > > > Sent: Sunday, February 17, 2008 12:09 PM > > > > To: [email protected] > > > > Subject: [Repeater-Builder] Wide Band / Narrow Band > > > > > > > > > > > > > > > > Our local fire, police and ambulance departments are going > > > to > > > Narrow Band > > > > per the FCC. I was told by one fire department that their > > > pagers > > > will only > > > > work one narrow band. Now this guy must be talking about > > > the tones > > > for the > > > > pagers? But to me wide or narrow the tones are the same. > > > Right? > > > Going > > > > narrow just means that they are taking up less of the band > > > width > > > for their > > > > frequency? He also said that scanners will not be able to > > > listen to > > > them > > > > unless the scanner is set up for narrow band. His wife > > > gave me her > > > nice > > > > Uniden BC-895XLT scanner because her husband told her the > > > same > > > thing. > > > > Some one who is in the know would like to fill us in on > > > the topic. > > > All EMS > > > > departments will be narrow band by April, in our area; > > > from what he > > > said. > > > > > > > > Rod > > > > > > > > > > Well, guys, it's not all that hard to narrow band a wide > > > band receiver, by narrowing the IF frequency amplifier / > > > limiter > > > circuit string by decreasing the coupling between stages and > > > making a > > > responce curve that looks like an inverted "V" rather than a > > > modified > > > inverted "W"..!! Modifying the discriminator depends on what > > > kind of > > > circuit it uses. > > > > > > Years ago when everybody went down to + - 5kc from + - 25KC, > > > that's > > > what we did.. On transmit just turn down the modulation.. > > > best done > > > with a Deviation Meter or a Service Monitor.. > > > > > > Dick, CET, W7TIO > > > > > > > > > > > Yahoo! Groups Links > > >
