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Good morning, This question is for all the 220 MHz repeater owners on the list. We have a 25W repeater and would like to add an amplifier as it hears much better than its transmit coverage. Our

I've tuned many an ARR preamp. They did make very minor changes during the life of the VDG series, but if you compare a P432VDG and P460VDG of the same vintage, they should have the same components,

ARR Preamplifier Comparisons I had an brief short amount of spare time to compare (and optimize) some used ARR receive preamplifiers, models ARR432VDG and ARR460VDG. Being specified for sale

Matt W6KGB makes darned GOOD preamps - the performance is equal or better than the no-longer-available Anglelinear in every way (and a helluva lot better than ARR, in fact the last time I was

Hi Ed, Just a thought . . I use a $37 ID-o-Matic IV for my Maxtrac 440 repeater to CW identify, control the fan, etc. They have a small add-on audio board (I think it was $20) to capture hold, and

Ed, For conventional ID is generally done via CWID during between transmissions, generally every 15 minutes for commercial and public safety. If a user keys up it overrides the ID and re-tries

Guys, We've come across some 380 to 400 MHz G.E. M7100 mobile and desktop radios that appear to be programmed for trunked operation. I have 2 questions:1.? Can they be tuned, or modified, for

^ TSRH The quantar has a different sort of receiver, it's second IF is direct to DSP, and the demod is done in the DSP chip on the SCM. They are very sensitive t

I am wondering how can a P25 repeater identifies, even in commercial application at 15 minute intervals? How would the FCC knows it's operational or not? In amateur application, at least a CW IDer.

Is there a way to program the code plug so that there is no PL tone transmitted? Tom Marshall AA1SM

I am seeking a 220 Preamp, maybe Advanced Receiver P220VDG or similar Please email me at k9ic.ars at gmail dot com thanks for your help Frank K9IC

It sure would help if you would quote the post you are talking about rather than make many of us guess. Mick - W7CAT

Items 2 and 3 in the previous post are both wrong. Radio Reference is the last place that I would even think about looking for P25 hardware information. You cannot get analog audio out of a P25

Sounds to me like the few "bad" mobiles are either off frequency or the two-point modulation isn't aligned correctly. As far as the latter issue, if the reference oscillator mod is wrong, it could

These are all good points Dan Woodie.? These are early quantars, circa 2003 or so all but one, five or six years newer... this entity has five total, and the later model is the one I first had this

Repeater-Builder@...> wrote: Since you didn't quote anyone's message we have no way of knowing what you are talking about or referring to. If by chance you are referring to the original

Tom, Have you tested the actual deviation of the mobiles in question to confirm that they were successfully narrowbanded? The fact that enabling wider receive bandwidth helped makes me suspicious.

Maybe the Mobiles are off frequency? First thing that springs to mind. Not up to speed on P25 related issues, or these particular radios though.. -Dave, KB7SVP

Thank you for the info. It helps a lot! Still miles to go before I sleep! ____________________________________________________________________________________________ *Seven Three* Ed McKinney -

1. P25 Phase 1 (C4FM) is one transmission per channel. P25 Phase II is two-slot TDMA which gives two voice paths per channel. 2. I’d suggest starting with the RadioReference.com Wiki which,