If the radio battery voltage drops below 9 volts it will stop broadcasting too I believe. What battery were you guys using? If the radio overheats it will definitely be hot when touched.
2 or 5 Hz Base Transmission
- Thread starter Jim Campi
- Start date
I had a similar issue with a Triumph 1 base today broadcasting over uhf.
Jim and Adam, were you guys using D8PSK or D16QAM modulation with 2 Hz corrections or D16QAM modulation with 5 Hz? Was the TX light off on the radio when you returned to it?
Jim Frame
Well-Known Member
I used D8PSK with 2 Hz. (I have no idea what that modulation code means, I just recall reading it here and went with it.) The TX light was off when I got back to the base. The radio wasn't hot, but several minutes had elapsed since losing signal, and it's conceivable that the radio was able to cool down in that time given the moderate ambient temp (65° or so). I was using a 55ah deep-cycle battery that was fully charged, so voltage shouldn't have been an issue. (I was also able to crank the radio at 35w for an hour or so after changing back to 1 Hz.)
The emission designators are slightly different for the different modulations. On my license I have all of them listed:
The modulation type specifies how the data in encoded in the radio signal. More information is available at https://en.wikipedia.org/wiki/Modulation if you are interested.
I could be wrong, but it seems to be loosely equivalent to baud rate, but, as Matt said, also includes how the data is encoded and decoded to produce the baud rate. This is just how I've interpreted it.
Yes it determines the baud rate. The modulations are listed in order from the lowest to highest baud rates in J-Field. The downside to choosing the modulations with higher baud rates is they are more subject to interference and data loss when the signal is weak. This information is in the spec sheets for the radios:
Yes, tried both mods. Txt light was off.
What power output were you using Adam when that happened?
4 watts on the hpt35
Jim Campi
Active Member
The first time I switched base transmission rate the radio was not transmitting.
If I recall correctly, a few parameters between the base and rober were not matched (all I changed was base trans rate). Changing the settings in setup screen didn't work. So, I recalled base setup on the rover, edited the setup and transmitted back to the base. Finally I recalled the rover setup on the LS, restarted the base and the radio transmitted without issue.
If I recall correctly, a few parameters between the base and rober were not matched (all I changed was base trans rate). Changing the settings in setup screen didn't work. So, I recalled base setup on the rover, edited the setup and transmitted back to the base. Finally I recalled the rover setup on the LS, restarted the base and the radio transmitted without issue.
Radio transmitted and worked great from the setup, it was exactly like Jim stated, about 20 minutes and it quit.
Nope all was yellow.
There's a difference, I was using the stable version.
Would that have anything to do with the radio?
I am not sure. How do you check this?