HPT435BT Power Consumption
- Thread starter Ryan Hand
- Start date
Nate The Surveyor
Well-Known Member
Ryan,
I don't know the answer to your question, but I do have a relevant comment.
My radio was broadcasting at 8 watts. It was getting very hot. It was draining the battery, very fast. Range was diminished. About 1/3 of what was normal.
I cleared the nvram. It quit getting hot, and battery life returned to normal. Range came back.
I surmise it had bunch of extraneous data accidently sending, so it was near 100% transmit, with no time out.
Just a thought.
N
I don't know the answer to your question, but I do have a relevant comment.
My radio was broadcasting at 8 watts. It was getting very hot. It was draining the battery, very fast. Range was diminished. About 1/3 of what was normal.
I cleared the nvram. It quit getting hot, and battery life returned to normal. Range came back.
I surmise it had bunch of extraneous data accidently sending, so it was near 100% transmit, with no time out.
Just a thought.
N
We can say that the power consumption "associated" with data count, and automatically toggle these settings in regards to data count. for example you can change the correction type and reduce the transmit duty cycle.
I wouldn't want to change anything that would affect quality of data coming in when I am taking a reading, but am interested if those settings can be toggled in between readings. Let's say I am driving and/or hiking to a section corner and don't need to be operating or taking any readings for a substantial amount of time. I would like to be able to decrease the power consumption of the radio if possible.
Nate The Surveyor
Well-Known Member
Ryan, it’s all one way coms. What you describe is 2 way coms. Ie, to be able to send instructions from rover to base, to slack (less data) up, then resume.
This adds a bunch of things. You then need a transceiver at both base and rover. A transceiver both receives, (rx) and transmits. (Tx).
Most units only have Tx at the base.
However, spread spectrum may do some 2 way coms of some kind.
N
This adds a bunch of things. You then need a transceiver at both base and rover. A transceiver both receives, (rx) and transmits. (Tx).
Most units only have Tx at the base.
However, spread spectrum may do some 2 way coms of some kind.
N
Thanks, Nate, that makes sense. One thing that is not clear to me is when the radio is in the three modes. Once the radio is connected to the battery and the base, and everything is up and running, is it set at continuous transmit for the duration of that time, or does it rest in the sleep or 30% duty cycle until you are actually receiving data from the rover?
when the radio is in the three modes - I want to explain in example. let's propose we have such configuration for modem, channel spacing 25 kHz, modulation DBPSK, FEC =1. for this parameter modem is capable to transmit about 950 byte per second. Of course modem connected to GNSS receiver, and periodically receive data (corrections) to retransmit to rovers.
Now let's assume that the period is 1 second, and in GNSS receiver send to modem about 950 byte per second.
For this condition you will have Continuous Transmit and therefore the power consumption will be in regard.
We can change the modulation type to DQPSK and the modem will capable transmit about 1900 bye per second. now with new modulation type transmitter will use about 500 ms for data transmission and the next 500 ms will be in idle state. for this case you will have 50% duty cycle
When we change channel spacing to 12.5 kHz, for DQPSK modulation we will have again about 950 byte per second and again we will have overheating.
In regards to correction type (amount of data) we recommend to change modulation type to decrease the duty cycle, for example 8PSK modulation and if possible 25 kHz channel spacing.
Now let's assume that the period is 1 second, and in GNSS receiver send to modem about 950 byte per second.
For this condition you will have Continuous Transmit and therefore the power consumption will be in regard.
We can change the modulation type to DQPSK and the modem will capable transmit about 1900 bye per second. now with new modulation type transmitter will use about 500 ms for data transmission and the next 500 ms will be in idle state. for this case you will have 50% duty cycle
When we change channel spacing to 12.5 kHz, for DQPSK modulation we will have again about 950 byte per second and again we will have overheating.
In regards to correction type (amount of data) we recommend to change modulation type to decrease the duty cycle, for example 8PSK modulation and if possible 25 kHz channel spacing.
Thank you. The main reason for this was to ensure my battery is being discharged at a rate that is not going to do any long term damage. My last 40AH AGM only made it a year and a half before I noticed the 8.75 volts it was putting out after a fresh charge. Needless to say this was affecting my range big time! However, with the amount of power consumption coming from the rated specs of the radio, I was likely depleting it far past 50% depth of discharge (which is around what most AGMs are rated at). Inevitably shortening the life of the battery. I have since upgraded to a Battle Born LiFePO4 battery which they state can be brought to 100% depth of discharge, without effecting battery life, and comes with an 8 year warranty!