That sounds suspiciously bad. There are likely other issues here. Have you tried running the handhelds at a reduced power setting? As long as the repeaters can hear them, should reduce selectivity issues.
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Transmit amplifier for digital repeater
- Thread starter tropiradio
- Start date
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Repeaters don't cycle between transmit and receive like the subscribers do, so any FM linear amplifier will work.
However, based on your description, more power will probably not solve your problem.
petnrdx
Member
Did I miss something?
Why are people saying "linear" amplifier.
Just needs to be Class C doesn't it?
And I agree with others that there sounds like something else going on such that increasing the TX is unlikely to solve.
The problem is the "near / far" issue.
Perhaps the portables have really poor selectivity, or TX is VERY dirty.
I didn't recognize the radio model.
Why are people saying "linear" amplifier.
Just needs to be Class C doesn't it?
And I agree with others that there sounds like something else going on such that increasing the TX is unlikely to solve.
The problem is the "near / far" issue.
Perhaps the portables have really poor selectivity, or TX is VERY dirty.
I didn't recognize the radio model.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
It appears to be be mix of Hytera and Motorola portables, with Motorola SLR5700 1U, 50w repeaters.
Too many variables, now including TG! The OP is relying mostly on second hand reports from users for diagnostics which is a problem.
My way of dealing with things like this is to if at all possible find a way to reproduce the problem on demand. Intermittent issues are a beast. Get a buddy and go to the problem area and try to make problem happen on demand. Look at receive signal strength on receiving radio (some moto’s will let you put them in a service mode showing db readings) and make an informal rf survey of signal strength. Once you have a repeatable fail setup/situation you can now see what helps or eliminates it— all of the things mentioned by posters here. Again, you need to be able to produce and see the fail yourself. Also, really good idea to sit down and plan out your test session logically in advance so you can go right to work onsite. Have a collection of several radios and models to see if they behave differently.
Totally anecdotal but I have observed many times having 2 or more DMR radios sitting next to each other on the same channel and talk group and when traffic comes in on that TG not all radios will unmute. It can vary which radio does unmute. I can only imagine something going on with IF leakage.
Question for the DMR experts here: aren’t there some settings such as preamble which can improve solid sync/lockup?
My way of dealing with things like this is to if at all possible find a way to reproduce the problem on demand. Intermittent issues are a beast. Get a buddy and go to the problem area and try to make problem happen on demand. Look at receive signal strength on receiving radio (some moto’s will let you put them in a service mode showing db readings) and make an informal rf survey of signal strength. Once you have a repeatable fail setup/situation you can now see what helps or eliminates it— all of the things mentioned by posters here. Again, you need to be able to produce and see the fail yourself. Also, really good idea to sit down and plan out your test session logically in advance so you can go right to work onsite. Have a collection of several radios and models to see if they behave differently.
Totally anecdotal but I have observed many times having 2 or more DMR radios sitting next to each other on the same channel and talk group and when traffic comes in on that TG not all radios will unmute. It can vary which radio does unmute. I can only imagine something going on with IF leakage.
Question for the DMR experts here: aren’t there some settings such as preamble which can improve solid sync/lockup?
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Apologies for the term 'linear'.
A PA for a FM repeater, rated at 100% duty cycle, will work just fine on many digital repeaters. P25 Phase 1(Non simulcast), DMR, NXDN, Fusion ect.
pddispatcher
Member
- Joined
- Nov 8, 2004
- Messages
- 18
High level of dumb on this post. Geez, I had to stop reading lol.
First off you should not have a 6.6 mhz spread on UHF or whatever the other is. The standard is 5 mhz.
Maybe when I get bored I will attempt to read the rest.
First off you should not have a 6.6 mhz spread on UHF or whatever the other is. The standard is 5 mhz.
Maybe when I get bored I will attempt to read the rest.
Maybe the OP isn't in the US. I think you should stop reading right about....now.
mmckenna
I ♥ Ø
The nice thing about standards is that there are so many to choose from. Especially in other countries.
Insert something about assumptions here:
pddispatcher
Member
- Joined
- Nov 8, 2004
- Messages
- 18
Let’s see where he is. 🙄
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
LMFAO. Better to remain silent, and be thought a fool, than to open your mouth, amd remove all doubt.
Where I live, we have part of the UHF spectrum that uses splits far larger than 5MHz. I've also seen frequency assignments for repeaters that are just 2 random UHF frequencies.
You also forget about T band in the USA, NOT 5MHz splits.
kayn1n32008
ØÆSØ Say it, say 'ENCRYPTION'
Or maybe stop writing and actually read, so he can see the OP isn't in the USA... before he says something even dumber than he already has.
pddispatcher
Member
- Joined
- Nov 8, 2004
- Messages
- 18
I guess I fit in with the rest of you idiots spewing stupidity post after post.
mmckenna
I ♥ Ø
OK, well, what's the solution then? If you know what's happening, I'm sure the OP would love to know.
