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informatie pagina voor experimenteel radio-onderzoekers

  Item for sale
  Item adressen
  Item fail-gallery
  Item press information
  Item weblog/news

 apparatuur foto's
  Item HP 331A distortion analyser
  Item Philips PM2524 multimeter
  Item Rigol DS-1054Z
  Item Sayrosa 261 frequentieteller

 applicaties (pc)
  Item UI-View (APRS)

  Item 27Mc
  Item FRS
  Item LPD
  Item PMR

  Item (E)EPROM
  Item crystals
  Item resistor coding

  Item RF Technology Days 2016

  Item 12VDC connector
  Item coax connectors
  Item Condor 16
  Item TNC connector

 Racal Cougar
  Item 0. Racal Cougar
  Item 1. introduction
  Item 2. compnents
  Item 3. assemblies
  Item 4. technical
  Item 5. modifications
  Item 6. data protocol
  Item 7. service

  Item boeken
  Item handleiding FUP1DZ
  Item jargon
  Item Morse code
  Item NATO alphabet
  Item Q-codes
  Item radio notebook

  Item 6H2N-EB / ECC83 / 12AX7
  Item algemene informatie
  Item ATP4 elektronenbuis
  Item elektronenbuis codering
  Item elektronenbuizen
  Item gloeistroom/-spanning
  Item reactiveren/reformeren
  Item stabilisatiebuizen

  Item 23 cm duplex filter
  Item Aerial Facilities BPD-410/420-3N
  Item Celwave P522 UHF duplexer
  Item Hoxin DX-720 diplexer
  Item JWX triplexer bc/2m/70cm
  Item Kenwood LF-30A LPF
  Item Motorola UHF cavity combiner
  Item Radiosystem RS460 cavity BPF
  Item stub filter [EN]
  Item basics: diplexer or duplexer

  Item AM-65/GRC
  Item LV-80 RF PA
  Item RT-70/GRC
  Item SEM antennetuner (AGAT)
  Item SEM25
  Item SEM25 gloeispanning
  Item SEM35

  Item krimplak
  Item schroefdraad
  Item verspanen

  Item 10/20/30 dB att
  Item BG7TBL noise source
  Item Daiwa CN-101L
  Item Daiwa CN-801
  Item HP P382A attenuator
  Item x-tal tester (DIY project)
  Item Krohn-Hite 4100 signal generator
  Item Radiosystem AB dummy load
  Item Rigol DSA815-TG
  Item Rohde&Schwarz SMT 02
  Item Spinner BN 52-77-66
  Item Zetagi DL50 dummyload

  Item 10 MHz low pass filter
  Item Frequency Electronics FE-5680A
  Item HP 10811 OCVCXO
  Item RS920 10MHz oscillator
  Item RS920 OCXO timestandard
  Item timestandard (general)
  Item time standard; BG7TBL
  Item tijdstandaard; VE2ZAZ
  Item time standard; W5OJM
  Item Trimble 34310-T OCVCXO
  Item Yaesu FT-8x7 (TC)XO

 meetapparatuur (info)
  Item (poor mans) spectrum analyser
  Item dummyload
  Item frequentieteller
  Item functiegenerator
  Item meetverzwakker
  Item octopus component tester
  Item oscillator adjustment
  Item staandegolfmeter
  Item test- en meetapparatuur

  Item Counter 1 MHz input mod.
  Item Yaesu FT-897/FT-897D
  Item Yaesu MH-48 lock mod

  Item (coax) kabels coderen
  Item APRS
  Item AWG draadtabel
  Item coax kabels testen
  Item Yaesu FT-8x7 CAT port
  Item paneelbouw

  Item (remote) coax switch
  Item afregelen FT-8x7(D)
  Item APRS basispost
  Item APRS tracker
  Item coax switch 1-8
  Item condensator microfoon
  Item counter prescaler
  Item CTCSS module
  Item FT-2000 headset
  Item FT-2000 remote
  Item FUP1DZS meetzender
  Item Geloso G.1/1040-A
  Item Geroh AKAC019 liermast
  Item go-kit
  Item headset (Avcomm)
  Item hoofdtelefoon versterker PL500
  Item Icom IC-25E
  Item Kerona AR-301 rotor
  Item KLV 400 RF PA ombouw
  Item Lineair 400W (Frinear)
  Item MFJ-948 antennetuner
  Item parallelle poort controller
  Item Pixie CW TX
  Item programmeren FT-8x7
  Item Samlex SEC 1223 voeding
  Item TH-D7E tracker
  Item Tinytrak 4
  Item uTracer 3+
  Item voedingsconnector FT-897
  Item VSWR SA meetbrug
  Item Yaesu FT-857/897 meter
  Item zwaai Alinco DR-135E MkII

  Item elektromigratie in filters

  Item Ameritron ATR-20 tuner
  Item Baofeng UV-5R
  Item Diamond X-30N rondstraler
  Item Icom IC-2e
  Item Icom IC-7300
  Item Kenwood TH-D7E
  Item Kenwood TS-830M
  Item MFJ-901b antennetuner
  Item MFJ-948 antennetuner
  Item MFJ-971 antenna tuner
  Item QYT KT-8900
  Item Triple-P TXU-1256 repeater
  Item Wouxun KG-UVD1P
  Item Wouxun speakermike
  Item Yaesu FT-101E
  Item Yaesu FT-1500M
  Item Yaesu FT-2000
  Item Yaesu FT-7800
  Item Yaesu FT-817
  Item Yaesu FT-857(D)
  Item Yaesu FT-897(D)
  Item Yaesu FT-8x7 serie
  Item Yaesu FT-991

  Item capacitors
  Item Geloso 3227 versterker
  Item Kenwood TS-830M
  Item Lorenz SEM25
  Item Yaesu FT-897D

 Rigol DSA815-TG
  Item meting: omroepband
  Item test: overspraak TG
  Item test: TG signaal

  Item elektret microphone
  Item Time Domain Reflectometer

 surplus apparatuur
  Item Bosch Condor 16
  Item Motorola GM950 (70 MHz)
  Item Rohill R-2050

 telefonie surplus
  Item Ericsson F-955
  Item Ericsson F-955 modifcations 2017
  Item Ericsson RS203/RS2062
  Item Nokia NCM30
  Item Nokia NNF30
  Item Nokia RD72
  Item Radiosystem monitoring unit
  Item Radiosystem RS922
  Item Radiosystem RS923
  Item Radiosystem RS950
  Item Radiosystem RS951
  Item Radiosystems RS963
  Item Radiosystems RS9694
  Item RS925 service box

  Item aarding
  Item antenna rotor
  Item antennetuner
  Item circulator/isolator
  Item snubber diode

  Item Minipro TL866 programmer
  Item Velleman VTSSC50N soldering iron
  Item Yihua 852D+ soldeering station
  Item ZD-409 desoldering tweezer
  Item ZD-915 desoldering station

  Item soldering
  Item workshop tips

  Item decoupling capacitors

  Item Beryllium oxide
  Item EM veldsterkte
  Item radioactiviteit
  Item harardous radioation?

  Item SV500


Nokia RRIC boards permalink:
This week I bought twenty surplus Nokia RRIC boards. When I bought them, it was very clear the warranty was void... I bought the board very cheap, primerely for salvaging the N-connectors for hamradio use. And there are some nice other components like several xtal oscillators and smd chips for practicing my smd soldering skills. I knew the condition of the boad when I bought them and for the price I couldn't complain. But I wondered what happened to the board before I bought them... Are they been run over by a truck?! Not only parts are missing/split in half, but parts of the pcb are crackked or even missing, including half of the connector!

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PLC overvoltage permalink:
On the image is a Siemens Logo! plc shown. This (brand new) one was wired to 230VAC. Since this is a 24VDC model, the result was a lot of smoke and a 16A blown fuse. Since my colleagues know ham-radio operators can use all kinds of broken equipment for components it was brought to me. Fixing was worth trying so the relics of the evaporated component were removed and the evaporated pcb trace was replaced by a piece of wire. After cleaning up the black stains, the plc was wired to a 24VDC power supply. And it's alive again! Resurrection after electrocution is not bad I guess...

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exploded regulator permalink:
On the image in the middle are two voltage regulators shown. The right one is as it should look like. The left one is exploded. It's very likely this happened by overvoltage and not by a production fault.

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realy bad caps! permalink:
Anyone who repairs old equipment are probably familiar with bad capacitors (by aging). Mains noise from old tube amplifiers is one of the indications of bad capacitors. Sometimes bad caps can be found by visual inspection since they start to bulge. This week I found two caps in a (still working) device. That they went bad could be seen from one meter distance... The first one is leaking (a lot) of fluid and is very bad corroded. The other one is dried out. When it was shaken, there is clearly a rattling sound to be heard. The exact age of the caps isn't known. They are at least two decades permanent in use; at least 175.000 hours...

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packaging fail... permalink:
Today I received two waveguide attenuators which I bought earlier this week. (For the record; model J382A and P382A, both from HP.) The "small" is in good shape, the "big" one... not so good. Since it was not packaged well enough, during transport one flange is badly damaged. The compression mark on the box can clearly be seen on the image, along with the other half of the flange. Luckily the cartboard box is not damaged badly and therefore it can be used again. ;-) And the attenuator... well, probably the housing will be used for another ham-radio building project...

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Kenwood TS-830S blown finals permalink:
The other day I started a repair project of a recently bought Kenwood TS-830M ham radio transceiver. The previous owner said there was "some problem" with the transmit function. After a thorough visual inspection the radio was hooked up to a variac. The voltage was (without any trouble) raised to mains level and some receiver functions were tested. I had a hunch that something was wrong. Therefore I setup a camera to record the final amplifier stage. During testing I checked the tubes visually and there was nothing wrong to be seen. Until two minutes after the powering up of the radio. The left tube started red plating, which I didn't notice.

One minute later the left tube failed by a bad flashover. I haven't examined the tube yet, but it's very likely that there's a grid/cathode short inside the tube. Grid/cathode short circuit seems to appear sometimes in these 6146B vacuum tubes. This all happened in receive mode.

The bad thing is that the previous owner soldered a wire across the (blown) mains fuse. (...) You probably can imagine the resulting damage. Probably this isn't the first time a seller lied.

USB stick permalink:
Today a colleague of the IT department asked if I could repair a broken (as in two pieces) USB stick. The USB stick was installed in the front of a PC which was on the floor. Someone hit the USB stick by accident and the pcb traces came off the pcb. Note; the same colleague always strongly advises not to place computers on the floor to prevent this types of accident. ;-)

Well, the repair... I like soldering, but SMT isn't my favorite. I like challenges and this seems a good one to test my skills. After cleaning the connector and scraping off the protective paint of the copper traces, the two pieces are placed onto a breadboard pcb using solder wire and double sided tape. Then four small wires are used to create the point to point connection. The thickness of the wire is 0,25mm/0,01" (AWG30). The soldering wire is four times thicker and the tip of the soldering iron is even six times bigger than the copper wire. That's not the ideal equipment, but surprisingly the "repair" went quite well and rather fast.

Luckily there was a stereo microscope which made the job quite easy. And the assembly works! The documents are saved and this USB stick is added to the hall of fame (or shame...)

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