WSP Mobile Extenders

[jpjohn]

I see that RR Database now has the following frequencies listed for mobile extenders:

172.275
465.125

I haven't heard much on the UHF frequency for the last couple of years and the VHF frequency is a new one to me. Can anyone provide some insight into these?

I always thought they used UHF so as not to interfer with the normal VHF frequencies. It also seems that I found a 172 Mhz frequency that was used for the troopers wireless mics (dashboard camera's).

Thanks ahead of time for clarifying this.

 

[bc780l]

If the mobile extender is enabled, when receiving traffic on the primary channel in the squad, that traffic is re-broadcast through the extender unit (if it is enabled). During the time the extender is transmitting, it is also interrupting its carrier at a preset rate to listen for traffic from the portable unit. This is to give the portable priority, and can be heard as a slight "chopping" of the signal from the car on the extender frequency. This is similar to simplex telephone interconnects on non-duplex commercial frequencies. I have not heard any mobile extender traffic on the listed UHF channels, but have on the VHF (more than one are listed in the FCC ULS, but I've not heard them in use--may be tied to regions). The separation in frequency from this VHF frequency to that of the primary channels is far enough that it should not cause desensing at low power. Frequently the extenders are left enabled and you can hear them as the squad drives by.

 

[RevGary]

(1) Observation and (2) a question for Stateboy -

(1) In District 3, I have noted mobile extenders and personal portables on 460.1250/465.1250 and 460.1750/465.1750. Just wondering if the WI database is incomplete here. FCC records indicate all listed above as active frequency pairs. (Also, look at the FCC data in the ULS site under call sign WQEI-466; interesting).

(2) Stateboy - is there a preference for a particular mobile extender frequency in District 2 and if so, why? Will one Trooper's extender portable work with ANOTHER crusier not his or her own OR are these CTCSS or digital 'tone' specific for each cruiser? Thanks.

 

[OpSec]

There was an adjancent user interference issue in D3 which caused some of the cars to use a different UHF freq for the repeater...I believe it was an issue in and around Green Bay (?)

Everywhere else in the state -should- be on the same freq, with the same PL. Otherwise, we'd have personnel with portables that don't work in some parts of the state, which defeats the purpose of having a statewide radio system. If for some reason a particular car has a repeater/portable on a different band then the standard, that trooper still has the standard issued portable for intrastate-operability with other units other than theirs.

 

[bc780l]

Must be multiple extenders in use. I have confirmed the use of 172.275 as a simplex extender, as described above, with DSP District 1 (excuse me, South-West Region-DeForest, 154.680) traffic on it. I've heard 171.425 chopping momentarily in the Madison area, but not confirmed what it was tied to. 170.475 and 171.575 are other frequencies under the same FCC ULS listings for WPZI866 and WQEI466, but I've heard no traffic on them. My past experience has shown multi-channel extenders and portables tied to in-car programmable extenders, i.e., switch to the channel you want "extended" to which channel on the portable. Since I'm now retired, can't tell you want they might be doing. Interesting thing is ULS shows these as forestry frequencies, but it wouldn't be the first time of "associated use" ...

 

[cpd38]

I could be wrong, but I thought that I read 171 something on my wireless microphone that works on my video camera system. I could take a look sometime at work

 

[cpd38]

I could be wrong, but I thought that I read 171 something on my wireless microphone that works on my video camera system. I could take a look sometime at work

Looking at the wireless transmitters we use--- we have 169.445, 170.245, 171.045, 171.845.

I don't have a clue if those need to be licensed or not. I doubt if anyone would hear them unless they are a couple feet away anyway.

 

[jpjohn]

I programmed in 172.275 into the scanner. I am hearing the WSP mobile extenders again - this would be for the Eau Claire Post.

Does anyone know if the Wisconsin DNR has a similar setup in use?

 

[t9590th]

DNR Comms

I have been told WI DNR is using cellullar telephones for most all of their communications. This seems to be very antiquated and slow to respond in the event of an incident or emergency and they need assistance. Can anyone provide up to date communication for the WI DNR and confirm what type of radio system they are using? Also I heard rumor their is a new digital P-25 system being installed for DNR, anyone else heard of this?


Todd
KA9WJD

 

[bc780l]

Off topic for this forum, but check http://www.radioreference.com/forums/showthread.php?t=49864 for info on the Dane County P25 system migration which also addresses the Statewide hybrid VHF/700/800MHz P25 system planning. Thus, I doubt DNR will be installing a separate system, rather will be integrated into whatever the state will be doing.