EVX-261 and HT750 only work one way.

[kurtbelyeu]

Hi RR,

I have a couple radios causing me some grief, a EVX-261 and HT750 both configured for the same personalities.. the problem is I can hear the EVX-261 transmit just fine on the HT750 but when I transmit on the HT750 I get nothing on the EVX-261.

Any helpful hints? maybe a smack upside the head for missing the obvious. Personality tables have been double and triple checked.

Kurt

 

[mmckenna]

Make 100% sure the PL/DPL settings on both radios are correct. Then check again. This is the most common cause of this issue.
If you checked it, and checked it again, and it's still correct, then you may have an alignment issue with one/both of the radios. Low PL deviation can result in it not triggering the other radio. Poor alignment on the receiver can cause issues.

 

[kurtbelyeu]

Make 100% sure the PL/DPL settings on both radios are correct. Then check again. This is the most common cause of this issue.
If you checked it, and checked it again, and it's still correct, then you may have an alignment issue with one/both of the radios. Low PL deviation can result in it not triggering the other radio. Poor alignment on the receiver can cause issues.

Interesting.. I can find the PL/DPL on the HT750 using CPS R06.12.05 but I don't see any of the PL/DPL settings on the newer Vertex EVX-261 radios using CE156.

Kurt

 

[mmckenna]

I don't see any of the PL/DPL settings on the newer Vertex EVX-261 radios using CE156.

I haven't touched Vertex gear in a long time. I'm sure someone here has and can point you in the right direction.
Sounds like the PL or DPL setting for the Vertex is wrong.

On that note, PL/DPL is technically a "Motorola" term. Other manufacturers use different names for the same thing:

So, these are all the same thing, see if one of them matches up with your Vertex:
PL = Private Line
CTCSS = Continuous Tone Coded Squelch System
QT = Quiet Tone
CG = Channel Guard
CT = Connect Tone
^^^ all the same thing, just different names for different brands.

Same thing for DPL = Digital Private Line
DCS = Digitally Coded Squelch (even though it says 'digital' it's used on analog radio)
DQT = Digital Quite Tone
etc…..

 

[clbsquared]

Vertex is listed under "sub audio". Bring the courser to the DEC ENC, highlight, and then press the space bar. This will get you into the PL / DPL selection.

 

[kurtbelyeu]

Hi gents!

I was able to get in and configure my radios with the DPL and setting the Sub Audio decode/encode. Now when I mic my HT750 I see the indicator on my EVX-261 light up and I get static but nothing legible but I am able to hear the EVX-261 clearly on the HT750. I grabbed a couple screen captures for you guys to take a look at.. again thanks for all the help.

Kurt

 

[kurtbelyeu]

Vertex is listed under "sub audio". Bring the courser to the DEC ENC, highlight, and then press the space bar. This will get you into the PL / DPL selection.

I couldn't select them because the channel was set for digital.. thanks for the heads up though. It allowed me to work through and figure out how to change them.

Kurt

 

[kurtbelyeu]

I just noticed that when transmitting on the HT750 I am getting a blinking green indicator on the EVX-261 which the manual says in a busy channel...

 

[a417]

How far apart are these radios when you are doing this?

 

[mmckenna]

I just noticed that when transmitting on the HT750 I am getting a blinking green indicator on the EVX-261 which the manual says in a busy channel...

Yeah, so that means it's receiving, but the squelch isn't opening. Another indication that you have the squelch programmed incorrectly, or one of the radios is far enough out of alignment that it's not going to work.

And as @a417 asked, how far apart are the radios when you are doing the test? If they are right side by side, you are going to overload the receiver and have issues. Take one of the radios and put it in another room (or other end of the house) and see if that fixes it.

 

[kurtbelyeu]

How far apart are these radios when you are doing this?

Probably 15 feet in a steel room.. I doubt its a distance issue since I have about 3 of each different kinds of radios in here (maintenance office) plus I've been testing with watch stander in the engine room.

Kurt

 

[kurtbelyeu]

Yeah, so that means it's receiving, but the squelch isn't opening. Another indication that you have the squelch programmed incorrectly, or one of the radios is far enough out of alignment that it's not going to work.

And as @a417 asked, how far apart are the radios when you are doing the test? If they are right side by side, you are going to overload the receiver and have issues. Take one of the radios and put it in another room (or other end of the house) and see if that fixes it.

I've tried both DPL and TPL with the same result.. I'm starting to think since the HT750's use a lot older of the Motorola programming software it make lack the settings to get them communicating. I reached out to Holland America where we purchase our radios but they didn't have much insight. FYI I do appreciate all your assistance.

Kurt

 

[clbsquared]

I've tried both DPL and TPL with the same result.. I'm starting to think since the HT750's use a lot older of the Motorola programming software it make lack the settings to get them communicating. I reached out to Holland America where we purchase our radios but they didn't have much insight. FYI I do appreciate all your assistance.

Kurt

An HT750 should have no problem communicating in analog to another radio in analog. The older CPS has nothing to do with it. Analog is analog. An M1225 and an APX8000 can communicate with each other in analog.
It would seem that you have an alignment or tuning issue. Swap the antenna on your 750 with a new one or a known working one. You could have a bad antenna.

 

[a417]

Probably 15 feet in a steel room.. I doubt its a distance issue since I have about 3 of each different kinds of radios in here (maintenance office) plus I've been testing with watch stander in the engine room.

Kurt

+1 to @clbsquared.

15 feet in a steel room? Sounds like desense is a good possibility if it's not out of tune. If the HT is recieving clearly but the other thing isn't, it could be that front end getting saturation bombed from the HT, not to mention the possibility of multipath... Try taking it outside and going a hundred feet apart, or so.

I'd expect to find out this other radio doesn't have half the RF filtering the Moto does.

 

[kurtbelyeu]

Hey guys I dropped back by to close this topic out.. I had my head buried in the sand, the radio in question was a dud.. when I tried one of the other radios (including all the other radios) they programmed just fine.

So to summarize I configured DPL for both TX and RX with the correct DPL code on each channel and they started working just fine.

Thanks for all the help!