Posts by ik4idy

Try This :

https://www.dishpointer.com/

or

https://www.satlex.us/en/azel_…de=it&diam_w=75&diam_h=80

73

Quote from DB8TF

ik4idy :

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

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Tu, giving up on this amplifier...

regards.

73

Quote from OH3WE

Sure! In the picture you'll see my homemade "connectors" using dual row, 2mm spaced pin array. Covered with hot melt glue. Original SMP output was located on the right of the circulator, ugly replacement SMA soldered instead. Could not find a SMP mating connector so I let it go.

Hi,

have you some information about modification and power supply for this amp ?

Thank you.

73 Alex

Quote from DD0KP

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

Quote from IU2KAC

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.

Quote from BG0AUB

I made it.BG0AUB QO100 DATV QPSK 1/2 10496.625 125k thank from M0SKM signal report.

Now I use is the circular polarization feed narrowband communications.How to make a line polarization feed for DATV launch?Who can help me...

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

Quote from DL5CN

Minimize the Mini-System - Searching the Satellite

Hallo,

another idea to reduce. The combination of LNB with horn and a scanner was used to check a location because of trees and buildings which prevent receiving.

The CW-Beacon helps to find a gap.

73s
Andreas

Nice job

I'm interested but this message appear when I'm trying to browse :

403Forbidden

В доступе отказаноВозможно, не загружен индексный файл или неправильно указаны права для него.

We keep finger crossed for Michelle, it's a good candidate for a great leadship.

Nice

Quote from Phil M0DNY

Hi All,

Maintenance has completed ahead of schedule, so the BATC & AMSAT-UK Narrowband WebSDR & Wideband Spectrum Monitor are now back open for use.

Thanks for your patience!

Phil M0DNY

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Thank you. The service helps all to use in a best way the wb transponder.

You doing a great service for all amateur community.

Regards.

Quote from DB2OS

The 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

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Some Broadcast on our transponder ?

Elevation ?

Quote from PY2RN

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

I belive to have the same issue.

Looking forward for a manual

73 Thanks

Regards

Form Amsat UK :

"At the RSGB AGM in Birmingham on Saturday, April 27, 2019 two awards were made in recognition of work related to the amateur radio transponders on the geostationary satellite Es’hail-2 / QO-100.

The prestigious Louis Varney Cup for Advances in Space Communication was awarded to Peter Gülzow DB2OS for his leadership of the team responsible for the Qatar-OSCAR-100 mission which is now in service."

Congratulations to Peter for this Prize and thanks to all Amsat-DL team for all the effort.

My solution to this issue is to insert a Russian transverter (cheap but stable), between the LNB at 432 and my ts 2000 at 28 MHz. I assure the success of this solution, the only issue to cure is the gain reducing with the the transceiver or adding ad attenuator on the lnb line id the noise is too hign.

73.