Addition power settings?

VK3KYY
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Re: Addition power settings?

Post by VK3KYY » Wed Feb 05, 2020 3:45 am

Forking the repo will make it much easier to keep things up to date, as you can use git to pull and merge from my repo.

Sometimes there will be merge conflicts which you will need to handle yourself, but most of the time, git should be able to automatically merge things

NA7Q
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Re: Addition power settings?

Post by NA7Q » Wed Feb 05, 2020 3:54 am

VK3KYY wrote:
Wed Feb 05, 2020 3:45 am
Forking the repo will make it much easier to keep things up to date, as you can use git to pull and merge from my repo.

Sometimes there will be merge conflicts which you will need to handle yourself, but most of the time, git should be able to automatically merge things
I pretty well do the merging manually. Gives me a better look at things than any automatic merging. Personal preference for learning, even if it's the hard way. It's still loads of fun. I have now forked it and merged my code.

Riku
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Re: Addition power settings?

Post by Riku » Thu Feb 06, 2020 7:27 pm

@VK3KYY i have measured power on 2 radios look video:
7 watts on VHF
https://www.youtube.com/watch?v=9Ffthnd-ADk

riku oh1e
Riku / OH1E
facebook fan group: https://facebook.com/groups/OpenGD77/

VK3KYY
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Re: Addition power settings?

Post by VK3KYY » Thu Feb 06, 2020 9:31 pm

Riku.

Have you calibrated the 1W and 5W values using the CPS, for the frequencies you are testing on ?

Riku
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Re: Addition power settings?

Post by Riku » Fri Feb 07, 2020 5:32 am

no calibration, just upgraded firmware and start using, like most of us do :)
but anyway i saw on github 5++ watt was removed, so no worries. they are ok now, only was 7watts way too much
Riku / OH1E
facebook fan group: https://facebook.com/groups/OpenGD77/

VK3KYY
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Re: Addition power settings?

Post by VK3KYY » Fri Feb 07, 2020 5:38 am

Riku wrote:
Fri Feb 07, 2020 5:32 am
no calibration, just upgraded firmware and start using, like most of us do :)
but anyway i saw on github 5++ watt was removed, so no worries. they are ok now, only was 7watts way too much
I may put the 5W++ back in at some time, as I know some people locally wanted to use it, but the user interface would need to be modified to make it harder to select.

Riku
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Re: Addition power settings?

Post by Riku » Fri Feb 07, 2020 12:05 pm

VK3KYY wrote:
Fri Feb 07, 2020 5:38 am

I may put the 5W++ back in at some time, as I know some people locally wanted to use it, but the user interface would need to be modified to make it harder to select.
totally agree on that :) maybe settings enable or something. it is only anyway for an emergency, normally that power should not be needed
Riku / OH1E
facebook fan group: https://facebook.com/groups/OpenGD77/

VK3KYY
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Re: Addition power settings?

Post by VK3KYY » Sun Feb 09, 2020 11:01 pm

As a matter of interest, I looked up the data sheet for the PA FETS

https://www.nxp.com/docs/en/data-sheet/AFT05MS004N.pdf

I think the same type of FET is used in both the VHF and UHF PA

As you can see, on VHF the FET actually rated at 6W ;-)

(But its only rated at between 4.1 and 4.9W on UHF depending on various factors)

Its also worth noting that on DMR its only 50% duty cycle. i.e only 50% of the heat dissipation would be required

VK3KYY
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Re: Addition power settings?

Post by VK3KYY » Mon Feb 10, 2020 3:28 am

As a quick follow up to this.

On UHF on my radio, as soon as the battery voltage gets down to around 65%, even selecting the 5W++ setting, the radio only just about manages to output 5W.

On VHF however, the power output does not seem so dependant on battery voltage, but when the battery gets down to around 60%, you will still need to select 5W++ to continue to get 5W on the output.

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