Hi Heiner,
I have been done exactly the same. This system is very simple and useful and it's the right approach to this issue.
best 73
Hi Heiner,
I have been done exactly the same. This system is very simple and useful and it's the right approach to this issue.
best 73
SO sad...great regret.
Well done Rocco !
Display MoreHint:
PCB's for homebrew 250W PA
then please look to G7NTG Jim chat messages from today at https://eshail.batc.org.uk/wb/
73,
Wolfgang
TU !
Hi all,
it's so difficult to receive confirmation in HF, on Oscar-100, after 30 Qso, only three confirmed. Someone tell about possibility to reach DXCC with QO-100, but continuing on this way it will be possible in 100 years, more or less...
Matt you are so lucky, 37 % of success is agreat result.
73
Display More
as Oh3WE wrote
"The pair of fets have very different biases. The other one warms up and draws a lot of current, about 50 watts of idle power warms up the shack.
Nevertheless the system delivers 70 watts output (perhaps more)."
I think this amp is also configured as a dohery type. The LDMOS in the middle of the PCB is the main amp an the one to the Corner is the Peak amp.
If you supply the 28V and measure only abt 1,9A current and only the main amp gets warm then you are sure. The gate bias on the main is about 2V, on the peak amp bias about 1,8V.
If properly "snowflaked" you can expect about 30% of the rated CW power on 2,4GHz with a relatively poor effectivity of abt 20-25%. If this LDMOS are the -130 types then expect not than 85W from that amp.
vy73 DB8TF
Tu, giving up on this amplifier...
regards.
73
Hi,
have you some information about modification and power supply for this amp ?
Thank you.
73 Alex
G4IUG x250 17db and x250-1 31db that is the main difference.. hope this helps you.
Heiner,
IU2KAC, ask more information about the development of an amplifier, built using the module described.
Would you get more information about it ?
Thank you.
73
Qualcuno ha acquistato il modulo PA da 250 Watt?
Perché nessuno ne parla? ...
Perchè se chiedi in italiano forse hanno problemi a risponderti .
Because if you ask in Italian they have some issues to answer...
Just for curiosity, has 9700 the "Frequency Transverter" capability like TS2000 ?
This is very good to set up frequency indicator to 10.490.xxx and 2400.xxx for a "right" frequency information.
Thank you.
Regards.
Zhao Feng,
the RHCP polarization is right, WB and NB trasnponders have the same polarizzation, but keep in mind that the feeder must be LHCP, due to "mirror" effect of the dish that change polarization. Furthermore if you are using a helix feed, this can be user for both transponders, but it's clear that when you transmitting on WB, you cannot do the same on NB, and viceversa (but if you have two TX dish, yes).
I hope having understood your request.
Congratulations for your's operation from China.
Regards an 73.
Alex
Nice job
I'm interested but this message appear when I'm trying to browse :
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В доступе отказаноВозможно, не загружен индексный файл или неправильно указаны права для него.
Display MoreThe list of lectures is getting longer:
Tag Uhrzeit Raum Thema 21. Juni 14:15 Raum Österreich DATV-Forum, QO-100: Project and operator's aspects Jens Schoon, DH6BB
AMSAT-DL
21. Juni 15:00 Raum Österreich DATV-Forum: DATV on OSCAR-100 Noel Matthews, G8GTZ
BATC
21. Juni 15:00 Halle A2, Raum 2 Geostationäre Amateurfunksatellit Es'hail-2 und der Empfang des 10GHz Downlink mit low budget Mitteln Andreas Auerswald, DL5CN (in deutsch) 22.Juni 14:00 - 15.15 Halle A2, Raum 2 Es'hail-2/AMSAT P4A (QO-100): The First Geostationary Amateur Radio Transponder Peter Gülzow, DB2OS (in englisch)
AMSAT-DL
22.Juni 15:30 - 16:45 Halle A2, Raum 2 AMSAT-P4A (QO-100) Groundstations: Experiences / Ideas / Proposals Achim Vollhardt, DH2VA (in englisch)
AMSAT-DL
Some Broadcast on our transponder ?
Elevation ?
Thank you, I have changed the settings as you indicated but still no luck, I believe the signals on the WB transponder are too weak for this part of the world, DATV will be very difficult to rx/tx from here, although the signals on the NB are very strong.
73
Ed PY2RN - ..-
This is very strange. Have you tryed to experiment the change of polarization ? Are you sure about the power supply to yours LNB at 18 V to reach the horizontal polarization ?
73
Okay, with the suggestion of JP I have been modified the LO ref. The procedure that I have been used is to, increase and decrease, by some try, the main frequency. I found good rx at 333 K/s decreasing 40 KHz. This difference is now applied to the LO, in main screen. Inserting now the real frequency (From BATC Spectrum WB) the Minitioune locks the signal. Now I will need to try with more lower rates.
More test will be done. Stay tuned.
73