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QSL: I DO NOT SEND OUT QSL CARDS - SORRY

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Licensed in 1965 and I have always been a keen constructor of radio equipment. In the early days this was valved equipment which included AM /SSB and many valve amplifiers. In more recent years I have moved to solid state and some examples are shown in the pictures. On HF I have a home built 4-band 2-element cubical Qmega matched for each band.

My LATEST SDR PROJECT:

Following the construction of the Hermes (shown on this page)  I decided to have a go at the Angelia board which I have built from component level using a homebrew reflow oven controlled by an Arduino.  Unfortunately I failed to get it work and to make it easier to fault find I then decided to purchase a ready built and tested board. I have not got around to sorting out the failed Angelia board yet because I have been spending time completing my latest SDR project which I have named: HPSDR-100DSX shown in pictures. I am also progressing other projects.

My HPSDR-100DSX   has a mosfet PA based on the Munin design, the LPF and HPF's are my own design (using ELSIE) populated on to ALEX bare PCB's which I have adapted to take different relays and toroids.  The LCD is based on a design by OK1DX with some modifications to suit my requirements (thanks Pavel )   I have also added HPF board for RX2 with the PCB incorporating some control relays and attenuators.  I made the case for a frequency meter some 40years ago from a scrap panel off a domestic appliance using a simple vice and bits of wood. This was now redundant and has been used again for this project.  The heatsink is off a Kenwood TS930 suitably cut and milled to fit this project.

I must take the opporunity to say a BIG THANK YOU to all those involved in the development of the HPSDR project and to Apache Labs for making bare PCB's and ready built and tested boards available for constructors like myself.

 

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SOLID STATE AMPLIFIER:

The home built solid sate amplifier shown below is made out of two RF modules made by Mackay Radio which have been modified with my own splitter/combiner units to combine four push pull pairs of MRF150's and changes to the biasing arrangements. The LPF is out of an old Marconi transmitter which has been modified to suit my amateur band requirements. The PSU is home built around a thyristor controlled stabiliser giving 50V @40Amps.

Protection for overvoltage, overcurrent, SWR,combiner out of balance and overdrive are included and all fitted into a homebrew cabinet.

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PICaSTAR TRANCEIVER

The following pictures show my version of Picastar based on a design by G3XJP. The graphic display is based on a design by G3VPX with a contribution from many others in respect of the hardware for the display part and other hardware making up this tranceiver.

Whilst some parts of the tranceiver is a hybrid of the original design work and many variations by myself I must acknowledge and express my gratitude for the fantastic work by all those involved with this project with particlular thanks to G3XJP, G3VPX, G6ALU, G6AK, G3TZR, VK3PE, VK3GRS and all those who provided help and assistance via the appropriate Yahoo reflector sites during the construction of this project.

 

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HERMES SDR Tranceiver:

This HERMES project (on air for the first time in February 2013) is my version of the HPSDR HERMES direct digital sampling tranceiver. The Hermes board has been built from component level with the help of a homebrew reflow oven (made out of a large biscuit tin, a cooker element fitted inside a chipboard framed insulating box and a PID thermostat) .

The Hermes board has replaced a softrock based sdr system which was built some years ago into the cabinet shown. The PA is mainly homebrew using an old burnt out PA/Heatsink unit from an FT707 (I think ?) and a modified LPF recovered from another Yaesu transceiver. I have added some pictures below:

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6169697 Last modified: 2015-07-16 00:21:03, 6027 bytes

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