I think my problem is not the PA, but the Pluto. Ido not see this fine behaviour regarding shoulders like at: https://wiki.batc.org.uk/Custom_DATV_Firmware_for_the_Pluto.
I will check first, if maybe the power level of my external 40 MHz TXCO is the problem.
Just made some tests and recogniozed, that Pluto is produzing quite strong shoulders. I measured about -18 dB at very little output drive off the Pluto. After the amplifier and over the satellite I could see them when I adjusted my signal to the strength of the beacon. Then I tried same with Portsdown / LimeSDRmini. Shoulder out the mini were -30dB and no shoulders on the satellite.
Shoulders at the Pluto signal are not related to the output drive.
Has anyone recognized similar behaviour?
How can we reduce the audio bitrate in OBS below 32kS? Would be interesting for RB-modes.
Robert thanks, super result. I just had the ports wrong: 8282 instead of 7272. Don't know why. So later on will try over the bird.
Ok, Robert, I will try these settings. Is it necessary to have PC and Pluto inside the same IP network? In your case 192.168.2.x, or sould it be different networks?
Hi Robert,
I have seen your transmissions over the satellite. I am using a GTX1050 card in a i7-9xxx PC and it is working very well using vMix, Portsdown and Toms script. But I want to use OBS and pluto in the future, as my vMix trial license is just for another 4 weeks.
Hi Ed,
Portsdown is a hardware system for DATV: https://wiki.batc.org.uk/Portsdown_2020. I am using the 2019 version, but with vMix. I have tried OBS and Pluto, but without success so far. rtmp and udp don't work here. I am also interested to see the right settings and the proper script for H265. If you are using Pluto, I think you don't need any Portsdown hard- or software, just the right OBS settings. Maybe someone could point us to the right information.
regards
Gerhard OE3GBB
I am testing this pallet driver amplifer: Andrew with MW7IC2240 chip. I have applied supply voltage 28V and both gate voltages (2,9V nominal), but did not get any quiescent current. Even an increase of the gate voltages to 4,6V did not show ANY drain current. Checked all the voltages on the chip itself. Any recomendations? I think the chip is dead.
I also have two of these boards with a combined shielding cover. One amp is behaving normal, the other one is starting to oscillate after applying the small input signal. Without signal it is stable. Amplifiers are on 50 Ohm dummy loads. Allready tried to reduce any feedback. Any hint what I should do to get this amp stable?
There was a similar discussion about SPLIT - operation.
