Op deze site vind je informatie over een aantal projecten waar ik mee bezig ben geweest.

Naast ombouw gegevens van bestaande (RF) apparatuur zijn er ook nog wat vergelijkende metingen te vinden.

Waar beschikbaar is de fabrieksdocumentatie geplaatst naast mijn eigen bevindingen.

Veel lees en hobby plezier toegewenst!


On this site you will find information about a number of projects I was working on.

Besides modification data of existing (RF) equipment you can find some comparing measurements.

Where available factory documentation has been placed beside my own findings.

Some of the information is in Dutch only. Have fun!



††††††††††††††† 2m FM††††††††††

†††††††††††††††††††††††††††††††††† Modification of Eddystone S2800 DAB Amplifier for use as 200 Watts power amplifier on 2 meter band.

Ombouw beschrijving Eddystone S2800/1 DAB Eindtrap /200W op 145 MHz (Dutch)(pdf)



††††††††††††††† 70 cm ATV††††

†††††††††††††††††††††††††††††††††††††††††††††† Low power: Pye / Philips 3913 466 29590 / 29600, four times BLV57 for 50 Watts peak sync on UHF

†††††††††††††††††††††††††††††††††††††††††††††† Datasheet PYE/Philips 3913 466 29590 /29600 (pdf)

Datasheet BLV57 (pdf)


Medium power: Marconi liquid cooled amplifier 8-206-7600-02, four times TPV8100 or BLV861 for 350 - 400 Watts peak sync on UHF

Praktische informatie 70 cm Marconi eindtrap. ATV 350W peak sync (Dutch) (html)

Technical manual Marconi liquid cooled amplifier 8-206-7600-02 (pdf)

Datasheet TPV8100 (pdf)

Datasheet BLV861 (pdf)


High power: Rohde&Schwarz VH501 Air cooled amplifier, uses sixteen times TPV8100 of BLV861 for 1500 Watts peak sync on UHF

Manual Rohde&Schwarz VH501A1 amplifier

Manual Rohde&Schwarz 1N503A1 power supply for VH501A1

Ombouw beschrijving VH501 voor 70cm ATV (Dutch)

Datasheet TPV8100 (pdf)

Datasheet BLV861 (pdf)


High power: Thales Air cooled DVB-T amplifier, uses sixteen times Ericsson 10037 or Philips BLF861 for 400 Watts DVB-T or 1500 Watts peak sync on UHF

Datasheet Ericsson 10037

Datasheet BLF861


Test results, QPSK 434.25MHz Symbol rate 1,7MS

0dBm from generator connected to the amplifier input gives 400W at output of amplifier


Output QPSK generator:††††††††††††††††††††††† Output on 400W DVB-T amplifier:



††††††††††††††† 13 cm ATV†††

Experimenting with 1800MHz Spectrian GSM amplifiers, not very useful for HAM radio

1800 MHz GSM Spectrian eindtrapjes (html)


Experimenting with JRC 2100 MHz Amplifier:

New 2009 13cm project, JRC WPAJ11 / NAH-2145D Power Amplifier Unit.

This UMTS amplifier uses 2 ericsson / Freescale MRF5S21100Hpower MOSFETS




†††††††††††††††††††††††††††††††††††††††††††††† First PA1RK test results July 2009: The unmodified unit is not useable for 13cm. The internal filters are for 2060 - 2200MHz.


Results tuned at 2330MHz:

MW4IC2230 only: 10dBm input, 36dBm output (4W) (tuned)

MW4IC2230 and MRF5S21100H, 10dBm input, 48,4dBm output (70W, tuned)

MRF5S21100H only, around 40dBm input, 49,5dBm output (90W, tuned) DC input 190W


So I suggest the best way to use the amplifier is to use only the two MRF5S21100H power amps and combine them with a 90deg combiner. Output power will be more than 150Watts.


†††††††††††††††††††††††††††††††††††††††††††††† >> Still working on a document with all the test results <<<



††††††††††††††† All bands††††††† Meting GSM Couplers (pdf)


Metingen aan VHF schakelaars;Daiwa of merkloos? (pdf)





73ís PA1RK, ( Robert uit Ede.