Difference in Frequency and Input?

[Cabinetmaster]

Just noticed on the database that under the input column in some of the listings that there is an apparent frequency and then also there is a frequency in the frequency column and they are different.

My question is do I program both in my scanner or just the one in the frequency column?

EXAMPLE: MHP Freq=42.16000 Input=42.24000 Dispatch for districts 2, 4 & 7. -----------Would I just use the 42.16000 ? or both?

My dad is a retired MHP and I have always listened to a scanner but I have a new one that I can put more codes in and was looking for some on the internet and ran across this site but the two frequencies in the column stumped me and I didnt want to program some in that I didnt need.

Thanks,
Cabinetmaster

 

[INDY72]

For the current MHP Lo Band System you will need to put both the mobiles, and the dispatch freqs in with NO delay. Example- MHP District 9 (Brookhaven substation)- 42.0800 MHz Dispatch, its counterpart is 42.3000 MHz which is for the Troop M Mobiles. YOu would also do well to program in the mobile repeater/vehiclular extenders 154.9350 MHz, and 158.9700 MHZ with a delay, and the Statewide Repeater Net for MHP- 45.3200 MHz with a delay, and of course Statewide Lo Band 45.2200 MHz also with a delay.

 

[SCPD]

Usually.... the "Input" is the input frequency for a repeater and the "Frequency" is the output frequency of the repeater. If you program the "Frequency" you should be able to hear both sides of the conversation. If you program the input you'll only hear the mobiles/portables accessing the repeater. By programming both frequencies you use up valuable memory space in your radio. This would be how it is done on a conventional repeater system.

If you're listening to a system that uses a duplex or semi-duplex operation then Milf's response is correct. I've noticed on some systems that are still on VHF Lo-band that use the configuration that Milf is talking about. The State of Tennessee is one of them, but they also use a 72mhz repeater link that allows one to listen to both sides of the conversation. I've been able to listen to mobiles, using VHF Lo-band, from 60 miles away with my handheld whereas before I could not.

Here in Georgia the Georgia State Patrol uses a VHF system without a repeater. The Base talks to the mobiles on 154.680mhz and the mobiles talk to the base on 154.800mhz. The mobiles can talk to each other on 154.680mhz if they're close enough, otherwise the base has to relay info from one car to another.

Check your database and see if there are any "Links" assigned to the system. It may allow you to listen to both sides of the transmission without a problem.

 

[INDY72]

Here in MS we use a Lo Band system without any repeaters for primary communications for the Mississippi Highway Safety Patrol. MHP does have a statewide network of Lo Band repeaters used primarily for long range car to car, and as backup for when the primary towers are offline. To listen to MHP you must program in both the dispatch, and the mobiles freqs..... Remember you won't hear the mobiles unless they are under 10 miles from you, and you won't hear the vehicular repeaters unless they within about 4 miles of you. In the few areas where MHP has TG's on local TRS's, most of these TG's are car to car..... but they are expanding to actual operations TG's as the patches are set up and linked properly.

 

[Cabinetmaster]

Thanks

Thanks, "Milf" and "Frootydawg" I am just sitting here soaking up the info you have given Thanks for both of your inputs,

Cabinetmaster

 

[INDY72]

No Prob my man, as the Admin for MS, I try to help out any way I can, and try to keep all the info current.