Update 10th Feb
Posted: Mon Feb 10, 2020 1:30 am
I didn't realise yesterday, when I released a new version, that the new feature from EA3IHI , to add a new channel using the parameters from the VFO, was ready to be included in the master version.
So I'm released a new version which has this feature, and also re-instates a modified version of the 5W++ power level.
https://github.com/rogerclarkmelbourne/ ... latest.sgl
The 5W++ power level can now be accessed by setting the power to 5W, and then pressing and holding Function + Right arrow.
The VFO -> New Chan functionality is accessed via the Orange button, and makes a new channel using the current VFO values.
The new channel is called "New Channel xxxx" where xxxx is the internal slot number in the codeplug channel data.
After creating the new channel the radio is switched to Channel mode and onto the All Channels zone, because this new channel is not added to a Zone, hence its only accessible via the All Channels zone.
BTW.
I did some research into the PA FET's in the GD-77, and it is supposed to be using this FET for both the UHF and VHF PA's
https://www.nxp.com/docs/en/data-sheet/AFT05MS004N.pdf
Interestingly this device is rated at 6W on VHF but only between 4.1 and 4.9W on UHF depending on various factors.
Obviously, its not just the rating of the FET its self that have to be taken into consideration, as the heat dissipation is also a major factor.
But on DMR, the heat dissipation is going to only be 50% of the heat dissipation of FM.
I think the "5W" quoted power of this radio is really just for marketing purposes. Technically its probably a 6W radio on VHF and a 4W radio on UHF, but that would not look good in the marketing blurb.
I'm also going to do some tests to look at the power output of the radio versus the battery voltage, because I'm sure that the output will drop considerably as the battery goes flat.
Ideally the power output could be corrected for batter voltage, but there isn't an easy way to do this, as I'm sure everyone's radio behaves differently.
So I'm released a new version which has this feature, and also re-instates a modified version of the 5W++ power level.
https://github.com/rogerclarkmelbourne/ ... latest.sgl
The 5W++ power level can now be accessed by setting the power to 5W, and then pressing and holding Function + Right arrow.
The VFO -> New Chan functionality is accessed via the Orange button, and makes a new channel using the current VFO values.
The new channel is called "New Channel xxxx" where xxxx is the internal slot number in the codeplug channel data.
After creating the new channel the radio is switched to Channel mode and onto the All Channels zone, because this new channel is not added to a Zone, hence its only accessible via the All Channels zone.
BTW.
I did some research into the PA FET's in the GD-77, and it is supposed to be using this FET for both the UHF and VHF PA's
https://www.nxp.com/docs/en/data-sheet/AFT05MS004N.pdf
Interestingly this device is rated at 6W on VHF but only between 4.1 and 4.9W on UHF depending on various factors.
Obviously, its not just the rating of the FET its self that have to be taken into consideration, as the heat dissipation is also a major factor.
But on DMR, the heat dissipation is going to only be 50% of the heat dissipation of FM.
I think the "5W" quoted power of this radio is really just for marketing purposes. Technically its probably a 6W radio on VHF and a 4W radio on UHF, but that would not look good in the marketing blurb.
I'm also going to do some tests to look at the power output of the radio versus the battery voltage, because I'm sure that the output will drop considerably as the battery goes flat.
Ideally the power output could be corrected for batter voltage, but there isn't an easy way to do this, as I'm sure everyone's radio behaves differently.