no TX power now

[kd2goe]

ok so i used a BNC Antenna Adapter on my PR400 and my CP150 radio with a mag mount UHF antenna i only keyed off on it a few times no more then 3 secs to do a voice test now i have NO TX power with the stock antenna i Hope i didnt just brake this radio i paid a lot for it...

I did meter every thing to make sure there was no shorts in the antenna to BNC every thing was fine

this is the related Post....
http://forums.radioreference.com/motorola-forum/264537-cp150-200-pr400-bnc-antenna-adapters.html


NOTE:
I played with it some more and it seems to only put out full power when i have the adaptor install but when i put the stock antenna i am not getting any any thing.... i am freeking out right now but it is time for bed i need to use the radios tomorrow

 

[kd2goe]

o man 100 ppl and no help

 

[TLF82]

Check the connections and make sure nothing is broken anywhere.
Sounds like the stock antenna is not getting a good connection.

 

[tornado229]

ok so i used a BNC Antenna Adapter on my PR400 and my CP150 radio with a mag mount UHF antenna i only keyed off on it a few times no more then 3 secs to do a voice test now i have NO TX power with the stock antenna i Hope i didnt just brake this radio i paid a lot for it...

Did you try pulling the parking brake release?

So do both radios only work with the adapter now? Or is it just one radio?

Sent from my MB860 using Tapatalk 2

 

[jim202]

Not having played with those exact model portables, I will have to guess and say that they use an SMA type connection for the antenna. There is a chance the adapter opened up the center pin connection or pushed it back down into the radio. Now when you screw the normal antenna back on, it is not making a good connection.

I would take a look at the bottom of your antenna and see if the small pin is there. Then look inside the antenna mounting hole and see what condition the center contact ha looking like.

If something has happened to that center pin connection inside the radio antenna hole, the radio will have to be serviced and repaired.

Normally those adapters work well. Unless you cranked it down with a wrench, there should not be much that can go wrong. Then there always is the possibility the adapter is out of spec. I just received a bag full of BNC adapter T connectors. One side of the female connections would work well. The other side would not allow the BNC outer ring to lock in. You could only turn it about half way and it would stop. So even the big boys that made the T adapter screw up now and then.

 

[kd2goe]

Did you try pulling the parking brake release?

So do both radios only work with the adapter now? Or is it just one radio?

Sent from my MB860 using Tapatalk 2

yes the 2 radios are doing the same thing.



the is what the stock

 

[kd2goe]

 

[kd2goe]

Not having played with those exact model portables, I will have to guess and say that they use an SMA type connection for the antenna. There is a chance the adapter opened up the center pin connection or pushed it back down into the radio. Now when you screw the normal antenna back on, it is not making a good connection.

I would take a look at the bottom of your antenna and see if the small pin is there. Then look inside the antenna mounting hole and see what condition the center contact ha looking like.

If something has happened to that center pin connection inside the radio antenna hole, the radio will have to be serviced and repaired.

Normally those adapters work well. Unless you cranked it down with a wrench, there should not be much that can go wrong. Then there always is the possibility the adapter is out of spec. I just received a bag full of BNC adapter T connectors. One side of the female connections would work well. The other side would not allow the BNC outer ring to lock in. You could only turn it about half way and it would stop. So even the big boys that made the T adapter screw up now and then.

the pin is in the adaptor and it was finger tight it is not a SMA connection

 

[mm]

The way the RF switch works is as follows. Normally the stock antenna threads in and the threads are hot with rf similar to the antenna connector on for example a old Saber ht

When the proper RF adapter is threaded in, the RF switch which is recessed inside the radio, senses the adapter and then it configures the normal threaded part to now be a ground point and the RF in/ out is then taken from the center pin of the RF adapter which is then connected to the internal deeply recessed connector which you can see in the picture looking down in the connector opening.

There are some adapters that look similar but they are not mechanically and it appears that your adapter has failed some way, it may have jammed the contacts thereby making the radio think that an RF adapter is connected at all times.

Mike

The correct adapter is a 4.15 mm coaxial bnc whic has a part number 5886564Z01

Sorry for all of the edit but I, m on a crappy rooted nook color and the touchscreen and edit features are archaic at best.

Things you can try are to see if some metal has flaked off the adapter and is shorting the ground side of the recessed switch to an adjacent ground in the radio which would thrn make the RF switch sense that the adapter is threaded in all of the time, if you have some compressed air then try blowing it inside the antenna connector and see if this fixes the problem.

 

[kd2goe]

The way the RF switch works is as follows. Normally the stock antenna threads in and the threads are hot with rf similar to the antenna connector on for example a old Saber ht

When the proper RF adapter is threaded in, the RF switch which is recessed inside the radio, senses the adapter and then it configures the normal threaded part to now be a ground point and the RF in/ out is then taken from the center pin of the RF adapter which is then connected to the internal deeply recessed connector which you can see in the picture looking down in the connector opening.

There are some adapters that look similar but they are not mechanically and it appears that your adapter has failed some way, it may have jammed the contacts thereby making the ravdio think that an RF adapter is connected at all times.

Mike

The correct adapter is a 4.15 mm coaxial bnc whic has a part number 5886564Z01

Sorry for all of the edit but I, m on a crappy rooted nook color and the touchscreen and edit features are archaic at best.

Things you can try are to see if some metal has flaked off the adapter and is shorting the ground side of the recessed switch to an adjacent ground in the radio which would thrn make the RF switch sense that the adapter is threaded in all of the time, if you have some compressed air then try blowing it inside the antenna connector and see if this fixes the problem.

Ok that is exactly what I am thinking we are on a road trip now and I am just useing my mag mount roof antenna...
This sucks but I guess I'll just get a universal BNC antenna

 

[kd2goe]

The correct adapter is a 4.15 mm coaxial bnc whic has a part number 5886564Z01

the stem that sticks in to the radio is 4mm x 7.94mm i got it from a loco radio shop around here

 

[mm]

I just looked at the adapter in the first picture and it sure looks like it is bent downward just enough that it could have damaged and permanately connected the recessed connectors outer terminal to ground.

From my understanding of how the switch works is that a connection is detected from the portable antenna connector threads, which is rf hot when using the rubber duck antenna, to theouter connector on the connector of the RF switch and this is when the RF output path is switched.

I don't t have a service manual for the radio but I think that when the internal RF switch senses the adapter connection that the center pin of the rf switch is switched for hot RF and the outer pin is simultaneously switched to ground thereby disconnecting the normal rubber duck thread point from being hot RF.

Why Motorola used such a convoluted method is beyond me but it seems like a recipe for failure or more likely they did this so that they can tie you into purchasing their overpriced precision milled adapter.

 

[kd2goe]

.

I don't t have a service manual for the radio but I think that when the internal RF switch senses the adapter connection that the center pin of the rf switch is switched for hot RF and the outer pin is simultaneously switched to ground thereby disconnecting the normal rubber duck thread point from being hot RF.

that is 100% seems to be whats going on..


.

Why Motorola used such a convoluted method is beyond me but it seems like a recipe for failure or more likely they did this so that they can tie you into purchasing their overpriced precision milled adapter.

yeah i give the pore guy at radio shack an ear full with me *****ing on why cant Motorola just use some sort of SMA connector when i stopped in looking for a simple UHF BNC antenna

 

[FFPM571]

Radio shack is the last place to ask for any advice on anything.. Motorola handheld radios are not really designed to work as makeshift mobiles. The connectors made are for testing RF output on a tech bench. If you needed a mobile radio you should have bought one...

 

[kd2goe]

Radio shack is the last place to ask for any advice on anything.. Motorola handheld radios are not really designed to work as makeshift mobiles.

Yeah i was not at Radio shack to ask for any advice, i was there to see if they had any antennas with a BNC end on them...

If you needed a mobile radio you should have bought one...

LOL what? I am holding it in my hand shure looks like a mobile radio to me..

The connectors made are for testing RF output on a tech bench.

it is now working if i leave the connector in with a BNC antenna. my frend lent me a extra ham radio antenna he had. I was gettting 3 miles eazy with the mag mount roof antanna so i will just have to live with it now....


the 2 connector i have look to be fne there no no bent parts but some how broke 2 radios... just my luck i guess.. when i get home i'll just blue lock tight them in and call it a day.

 

[FFPM571]

A mobile radio is what you would mount in a vehicle. You have a handheld portable radio.