REVIEW: AN/PRC-148 MBITR, working replica by United-Star

Sitting1Duck · July 8th, 2011, 14:36

Hello guys.

I'm from europe and i want to program PMR frequencies on my United Star. Can i use sub-channels in this radio? Does anyone here have a file to program sub-channels?
Somebody wrote here that i can only use CTCSS codes on full channel mode. I don't understand this. I need some explanation about using CTCSS codes on this radio. Sorry for my ignorance

bohumin · July 13th, 2011, 09:06

Guys, does anyone of you use a real Thales broadband antenna insted of a replica?
Please tell if the difference between replica and a real one is so "breath taking" as SaltWaterDrinker said?

Viking_Dane · July 14th, 2011, 09:24

Quote:

Originally Posted by bohumin

Guys, does anyone of you use a real Thales broadband antenna insted of a replica?
Please tell if the difference between replica and a real one is so "breath taking" as SaltWaterDrinker said?

First off, the Thales antenna is a REAL broadband antenna, the replica antenna is not. So once you get outside the frequency range of the replica antenna, there is going to be a HUGE deference. My replica antenna is tuned for 400-470 MHz by default, and is useless out side of that scope, the Thales antenna is tune for use in the 90-512 MHz range.
I suggest that you read up on some basic Antenna theory, once you understand the basics you will have a much better understanding of the deference between the to antennas and why the replica is no good outside its frequency range.
Go to http://www.antanna-theory.com is a good site with solid basic Theory and more advanced theory. Happy reading

Mike-NL · July 17th, 2011, 07:59

Hey guys.

First of all my apologie for the bad grammar englisch.

Update:

Well, it seems to be that the head set i recently bought is a Z element headset.(shame)
I hooked it up en tested and what i got so far is excellent sound on the receiving part but the transmitting part is so quiet that i have to sett the volume of the receiving PMR to its maximum and still its to quiet to make anything out of the transmission.
I am stuck, anybody any idea's

cheers Mike

Mysuperior · July 20th, 2011, 04:26

Mike-NL.. If u read the whole thread u will notice this subject has been mentioned a few times, the impedence is the problem.. How to solve this u can find by actually reading it again and if you dont find it.. re-read it

Balnk · July 20th, 2011, 05:44

Mysuperior, you make it seem like there is an easy fix. I don't think there is one that is proven to work. The subject of getting the impedence correct is still cloudy.

Conker · July 20th, 2011, 19:29

Click HERE

Mysuperior · July 22nd, 2011, 09:44

Balnk: the problem has been solved and there is a couple of ppl that has fixed it, to fix a impedence match you have to switch the mic (yes on a sordin) to electret mic condenser, u can take one from a ACM sordin desolder it and put it in the RS sordin, notice that there is plus and minus contacts.. But if u solder it wrong its just to resolder it.. There is some ppl on the swedish equilant that have done this with success, it works pretty much as with the comtacs but switching only the mic

EagleDriver · July 22nd, 2011, 10:07

What Balnk means is that switching the mic is not always where the issue is. On my Peltor made PTT for my dual comm Comtac, Peltor had to change the wiring within the push to talk to get the radio to transmit. There was no difference with real versus knockoff microphone and I still use the same microphone as when I bought it.

What I am wondering, is that since I bought my Comtac II headset only about a year ago, did they make a change to the headset.

jurgen975 · July 23rd, 2011, 15:47

Looks like these radios are sold out everywhere,if anyone knows a shop where they are still selling them let me know

Mysuperior · July 23rd, 2011, 16:10

EagleDriver: ok, I see.. did they transmit at all? I got no replica so I can't test.

If there's no transmission at all its probably something wrong with the PTT or headset but if there's a low transmission it's probably only to switch the mic

OR someone with to much money could try with a TCI high amplifier PTT

EagleDriver · July 24th, 2011, 12:21

If I recall correctly with mine when you keyed the mic you could hear the carrier but nothing that was spoken. This was the case with both real and replica mics.

KNUDI · July 24th, 2011, 20:06

Quote:

Originally Posted by Conker

http://img221.imageshack.us/img221/2717/u94k.jpg

Click HERE

I ordered one, i'll give u a short report if it will work when it arrived.

Viking_Dane · August 5th, 2011, 08:15

Here are som pictures of the internals of the replica antenna, next step is to modify it to a broadband antenna. More on this will be posted as i make progress.

Sitting1Duck · August 7th, 2011, 16:43

I bought a MSA Gallet matching box. I'm going to try it tomorrow and see if it works. I believe it will match the impedance between my rs Comtac II and the United Star.

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July 8th, 2011, 14:36	#346
Sitting1Duck Trader rating Join Date: Jul 2011	PMR frequencies Hello guys. I'm from europe and i want to program PMR frequencies on my United Star. Can i use sub-channels in this radio? Does anyone here have a file to program sub-channels? Somebody wrote here that i can only use CTCSS codes on full channel mode. I don't understand this. I need some explanation about using CTCSS codes on this radio. Sorry for my ignorance

July 13th, 2011, 09:06	#347
bohumin Trader rating Join Date: Jun 2011	Guys, does anyone of you use a real Thales broadband antenna insted of a replica? Please tell if the difference between replica and a real one is so "breath taking" as SaltWaterDrinker said? Last edited by bohumin; July 13th, 2011 at 09:13..

July 17th, 2011, 07:59	#349
Mike-NL Trader rating Join Date: Jul 2011	Hey guys. First of all my apologie for the bad grammar englisch. Update: Well, it seems to be that the head set i recently bought is a Z element headset.(shame) I hooked it up en tested and what i got so far is excellent sound on the receiving part but the transmitting part is so quiet that i have to sett the volume of the receiving PMR to its maximum and still its to quiet to make anything out of the transmission. I am stuck, anybody any idea's cheers Mike Last edited by Mike-NL; July 19th, 2011 at 20:00.. Reason: Progress

July 20th, 2011, 04:26	#350
Mysuperior Trader rating Join Date: Dec 2010	Mike-NL.. If u read the whole thread u will notice this subject has been mentioned a few times, the impedence is the problem.. How to solve this u can find by actually reading it again and if you dont find it.. re-read it

July 20th, 2011, 05:44	#351
Balnk Trader rating Join Date: Nov 2010	Mysuperior, you make it seem like there is an easy fix. I don't think there is one that is proven to work. The subject of getting the impedence correct is still cloudy.

July 20th, 2011, 19:29	#352
Conker Trader rating Join Date: Jan 2007 Location: Canada / Ireland / USA	Click HERE __________________ WTS: King Arms/Madbull Mk18 Mod1 - VFC Mk17 SCAR-H midcap mags, FDE - VFC Mk17 SCAR-H + PWS rail, FDE WTB/WTT: CSOR gear, BFG, Tyr, Crye, etc

July 22nd, 2011, 09:44	#353
Mysuperior Trader rating Join Date: Dec 2010	Balnk: the problem has been solved and there is a couple of ppl that has fixed it, to fix a impedence match you have to switch the mic (yes on a sordin) to electret mic condenser, u can take one from a ACM sordin desolder it and put it in the RS sordin, notice that there is plus and minus contacts.. But if u solder it wrong its just to resolder it.. There is some ppl on the swedish equilant that have done this with success, it works pretty much as with the comtacs but switching only the mic

July 22nd, 2011, 10:07	#354
EagleDriver Trader rating Join Date: Feb 2009 Location: Baltimore, MD USA	What Balnk means is that switching the mic is not always where the issue is. On my Peltor made PTT for my dual comm Comtac, Peltor had to change the wiring within the push to talk to get the radio to transmit. There was no difference with real versus knockoff microphone and I still use the same microphone as when I bought it. What I am wondering, is that since I bought my Comtac II headset only about a year ago, did they make a change to the headset.

July 23rd, 2011, 15:47	#355
jurgen975 Trader rating Join Date: Oct 2008 Location: netherlands	Looks like these radios are sold out everywhere,if anyone knows a shop where they are still selling them let me know

July 23rd, 2011, 16:10	#356
Mysuperior Trader rating Join Date: Dec 2010	EagleDriver: ok, I see.. did they transmit at all? I got no replica so I can't test. If there's no transmission at all its probably something wrong with the PTT or headset but if there's a low transmission it's probably only to switch the mic OR someone with to much money could try with a TCI high amplifier PTT

July 24th, 2011, 12:21	#357
EagleDriver Trader rating Join Date: Feb 2009 Location: Baltimore, MD USA	If I recall correctly with mine when you keyed the mic you could hear the carrier but nothing that was spoken. This was the case with both real and replica mics.

August 7th, 2011, 16:43	#360
Sitting1Duck Trader rating Join Date: Jul 2011	I bought a MSA Gallet matching box. I'm going to try it tomorrow and see if it works. I believe it will match the impedance between my rs Comtac II and the United Star.

REVIEW: AN/PRC-148 MBITR, working replica by United-Star

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