TK 730 (G)H--problem programming "split" frequenci

4203radio · Post by **4203radio** » Sun Oct 09, 2005 12:23 am

I've got a TK 730(G)H that I cannot get it to program split frequencies like 158.9175 It reverts to 158.915 when I try to program 158.9175 Any ideas on how to fix this; or am I simply doing something wrong with the radio? The 158.9175 was recently issued to a local EMS provider.

Thanks!!

n5tbu · Post by **n5tbu** » Sun Oct 09, 2005 5:12 am

Just go with the 158.915.it is so close,you can hardly see the difference with a service monitor,there is no other way around this.
mod

k2hz · Post by **k2hz** » Sun Oct 09, 2005 2:48 pm

[quote="n5tbu"]Just go with the 158.915.it is so close,you can hardly see the difference with a service monitor,there is no other way around this.
mod[/qu

158.915 is 2500 Hz off from the assigned frequency. If you "can hardly see the difference with your service monitor" something is seriously wrong with your monitor. Anything beyond 1000 Hz error is way out of FCC tolerance and will be severly distoted on a narrow band receiver and cause adjacent channel interference.

The answer is that the 730 is not capable of operating on the new FCC 7.5KHz narrow band splits.

n5tbu · Post by **n5tbu** » Sun Oct 09, 2005 3:27 pm

What I meant was this....rec sensitivity on the rounded freq,will hardly change.
I ran a test between a 730G and an M1225 which could take the proper freq,the two radios talk to each other with no problems.Beats replacing a 1500 dollar radio.
mod

k2hz · Post by **k2hz** » Sun Oct 09, 2005 4:10 pm

n5tbu wrote:What I meant was this....rec sensitivity on the rounded freq,will hardly change.
I ran a test between a 730G and an M1225 which could take the proper freq,the two radios talk to each other with no problems.Beats replacing a 1500 dollar radio.
mod

So you are saying it is OK for a Public Safety user to deliberatly violate FCC Rules and operate on an unauthorized frequency, degrade their own operations and cause interference to others becuse they don't want to spend the money to buy a proper radio to operate on the new frequencies?????

The 7.5KHz splits are problematical to begin with and if systems start operating in between authorized channels it will be total chaos.

In my experience, off frequency operation with wide band receivers will cause some audio distortion for CSQ but will cause severe "pumping" of PL and DPL on voice peaks. In a narrow band receiver, a 2500 HZ error would cause the signal to be severly distorted and generally unreadable.

The FCC frequency toleance at 159MHz for a narrow band system is 397 Hz for base stations and 795 HZ for mobiles.

n5tbu · Post by **n5tbu** » Sun Oct 09, 2005 5:13 pm

AS I said before,I fully tested the 730G (which IS a narrow capable radio) with an M1225,in narrow band mode,no distorsion or pl pumping was noticed.
Both radios recieve much wider than the off freq difference.
You are correct on the FCC and radio type approval.

over.

4203radio · Post by **4203radio** » Tue Oct 18, 2005 5:45 am

Thanks, guys, for the help!