Skip to main content

cheap genuine RD15HVF1 do'nt exist

                on eBay or UTsource (above)   its all fake UT source did refund
 left is the genuine a bit smaller then the TO220 IRF stamped as RD15HVF1
The original RD15xx types have a small Gate to source C ca 80pF and the source at pin 2
The fake have high gate - C  this one 800-900pF  and its source is pin 3 like all IRF -types
The IRF510 has the lowest gate capacity of about 400pF the best of the rest

Misubishi's   RD15HVF1 is an  UNIQUE  VHF power FET.
With its Source at pin2 = cooling flange,  the only right  place of course
No other manufacturers deliver comparable divices.
It must be hard to produce. The eBay offered types are all fake cheap IRF5xx imitations in fact fraude.
The RD15xxx is relative expensive for a small FET  5-7€  from vendors that will easy take 50$ or more for shipment.
Not sold by  Farnell Digi Key Reicheld  and Mouser
In RF high power FET segment there is plenty of choice  but   it's crisis in HF VHF  medium power land. The classic bipolar RF medium power transistors are no longer produced.

                                          this is how a  real RD15HVF1 is measured

Claims van de DAC 1296 MHz 3e dinsdag contest van 2018-07-17 17:00UTC tot 2018-07-17 21:00UTC. Uiterlijke inleverdatum van de logs is tot en met 2018-07-24!

1.3 GHz
SectieCallsignLocQSOstot kmkm/QSOLoc BonusTotal PointsCall Best DXLoc Best DXAfstandPowerAntenneLogStatusMaps
HP03
PA0TJO33JC2486363601717136SM6VTZJO58UJ664 km100
1,2m dish...
EDI
log ontvangen...
map
HP03
PA0SJO21FW2077653881716265OK1KZEJN79FX733 km100
245 cm Dish...
EDI
log ontvangen...
map
HP03
PA0OJO33HG1249214101210921OK1KZEJN79FX652 km30
1m20 dish...
EDI
log ontvangen...
map
HP03
PE1EWRJO11SL1749202891110420OZ3ZJO55BJ616 km100
2*25 el Loopy...
EDI
log ontvangen...
map
HP03
PA0WMXJO21XI124637386109637SK7MWJO65MJ650 km100
1.8m dish...
EDI
log ontvangen...
map
HP03
PH4XJO22QE2117658822176OZ3ZJO57BJ654 km120
9el LFA...
EDI
log ontvangen...
map


Comments

Archive

Show more

Popular posts from this blog

2011-01-22 DIAMOND 2m 70cm 1m30 Colinear inside

Having relative poor signals on the local 70cm / 2m channels using this X50 Diamond collinear 70/2  1m antenna at a height of 25m. I needed to investigate what could be wrong. Measuring the cable only 3W is left for the antenna of the 10W 435MHz output from a IC451E The cable is 30m type H100 Z50 10mm outside diameter it is semi air-spaced but has an impossible 4mm² solid CU inner conductor not much air left. I preferred the H43 Z75 cable having lower loss and mechanical better ratio in conductor size. My antenna uses SO239 connector UHF type semi air spaced isolator.  3W should be enough for a comfortable noise free FM signal. But only 27km away at PA0A the signal is weak too weak something must be wrong? I made a simple reference dipole of 2x17cm CU wire. With this dipole the signals where totally worse. So the Diamond does work? I got curious to look inside. Maybe moisture penetration degraded the antenna. This  antenna is rainwater close in its n...

SPF5189z Low noise preamp 23cm

 14-4-2018 updated Above the low noise  preamp 50 - 4GHz    ebay  6€ Tested  2 small porto antennas 1 Baofeng UV antenna left   2nd best signal on PI2NOS 2 eBay DIAMONDSRH805S  wide band 144/432/1200  it works for its size as expected 3 piece of wire :   best signal in the setup... Unit under test at workbench. It was stable  50mA  at 5V   few days,  but sudden the current went up to 100mA And i could  no longer adjust it with the negative bias Voltage. The - Voltage went to zero and the SPF input port became low Z. This SPF5189z was broken  no oscillations, no input overload just it broke while i was receiving the PI2NOS 430.125 using a small antenna at the workbench. The specs of  SPF5189z  say it has an internal circuit  regulating the bias current. Replaced . again   with an other of the 5 spare SPF i have. The new one again could be adjuste...

BIJZEN mast en ontwerp fouten.

In 2013 heb ik een Bijzen aluminium mast 3 x7m  opgehaald  bij iemand die hem niet mocht plaatsen Gemeente Oss  dat zegt misschien al genoeg.. Pas in 2018 heb ik hem geplaatst had ik veel eerder moeten doen. Mooie mast, mijn xyl vond hem zelfs mooi. Hij is licht, de 3 delen wegen  235kg  het vaste deel 102kg dus het te lieren gedeelte weegt   slechts 133kg + ca 50kg rotor + antennes etc.  De elektrische lier is wel erg zwaar 30kg misschien wel maar die zit onder    Antenne  3ele Steppir  19kG  +  G2500DXC rotor: 3.6kg  + rotorbuis 12 kg  +  kabels 10kg  + 5/7 ele 6m beam. ongeveer 50kg Je moet niet te dichtbij  kijken, dan valt op dat het Aluminium lastwerk heel slordig is gedaan, scherpe bramen aan de lassen waar kabels door kunnen worden beschadigd of haken Er is zeer ! weinig ruimte voor de rotor een YAESU G2500DX past net maar dan ook net  met beetje buigen van  kruisverband. Het...