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AVO No 1 Radiac Survey Meter or Geiger C...

AVO No 1 Radiac Survey Meter or Geiger Counter

AVO No 1 Radiac Survey Meter or Geiger Counter If you attend Ham Radio Rallies in the UK, especially in the North East of England, you will know Alan Clegg a.k.a. ‘The Valve Man’. He bears a striking resemblance to Santa Claus and, quite often, helps people find wonderful things that bring a smile to […]

Maplin Ranger 160m Receiver

Maplin Ranger 160m Receiver

Maplin produced another little receiver, in addition to the famous direct conversion project from 1988…it was called the Maplin Ranger.  The 160m receiver covered from 1.8 to 2.2MHz and was designed for AM, SSB and CW.  This time the receiver is a ‘proper’ superheterodyne design with an IF of 455KHz. I obtained one of these […]

Yaesu FT-897 Ceramic Filter Problem

Yaesu FT-897 Ceramic Filter Problem

The Yaesu FT-897 has been around since about 2002…they’ve sold thousands of them and they are still popular today.  The FT-897 is pretty much a ‘shack in a box’ covering all the HF bands plus 6,2 and 70.  Yaesu, at the time of writing, still have all the details on their website here…so I won’t […]

Kenwood / Trio TS-900 Extender Card

Kenwood / Trio TS-900 Extender Card

If you have one of the older classic transceivers, servicing and repairing them can be a real pain without the service manual…and the necessary extender cards, to lift your desired board clear of the others.  Service manuals are normally easy to find on line, but the extender cards are rare.  I’ve managed to assemble sets […]

Blekok Micro-40S SSB Transceiver

Blekok Micro-40S SSB Transceiver

The Micro-40S is a single board SSB Transceiver by Indra Ekoputro YD1JJJ.  I didn’t buy one of these thankfully, but a friend brought one for some TLC.  These things are supplied rather badly, ready built and working.  The one that came to me had a short circuit IRF510 output PA MOSFET.  An easy fix but […]

STE (Milano) 2m VHF Tx and Rx Modules

STE (Milano) 2m VHF Tx and Rx Modules

I recently acquired a homebrew transceiver from the Angel of the North Radio Rally.  It’s a 2m / 145MHz FM unit with crystal control, that outputs a heady 1W of RF.  Crystals are installed for the local repeaters and simplex channels used in the 1980’s, when people actually used 2m before upgrading to a class […]

Kenwood TR-751E 6v Inverter Fault

Kenwood TR-751E 6v Inverter Fault

The Kenwood TR-751E is an ageing but still fantastic 2m (144MHz) multimode transceiver.  Like all things, me included, as they get older parts start to fail.  The TR-751E I had to repair had been dropped, which meant the RF Gain / RIT dual concentric potentiometer needed straightening…the main VFO knob had already been glued.  It […]

3B/240M Tube on HF

3B/240M Tube on HF

Has anyone out there ever used a 3B/240M (CV2214) valve / tube in an HF amplifier? I came across one of these, new and boxed, amongst my collection of treasured family heirlooms…it looks like a miniature 5B/254M but isn’t.  The 3B/240M or CV2214 is a small grounded grid triode for use up to 200MHz.  It […]

SEI Crystal Filter Data

SEI Crystal Filter Data

Some years ago I acquired some superb…and originally very expensive…SEI Crystal Filters on 1.4MHz.  I knew I had a USB and LSB pair, but didn’t know which was which and had no idea about the correct termination impedance.  What I needed was SEI Crystal Filter Data…which no one had.  There have been lots of questions […]

 
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