gw4wph




Backstreet QRP...

The Tuna Tin

009

 

A 40m cw transmitter built on top of a tuna tin. Originally designed
by Doug DeMaw W1FB. It provides about 350MW of RF and the amplifier
is approximately 70% efficient.

 

 

 


010

 

 

 

 

 

 

 

  014

 

 

 

 

 

 


 

The NorCal 20

029

 

This is the NorCal 20 A QRP CW transciever for 20M RF. Output is approximately 7W. Full RX/TX switching hence no relays. This gives "thump free" semi break in operation.

Single conversion superhet. If is at 9Mhz and VFO at 5Mhz.

No dial calibration is required because the rig has a built in audio style frequency counter that announces the Khz frequency "to you" in morse.

 

031

 

 

 

 

 

 

032

 

 

 

 

 

 

 


 

077

 

 

 

 

 

 

079

 

 

 

 

 

 

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082

 

 

 

 

 

 

 


 

The MKARS 80

056

 

A design from Steve Drury G6ALU and was a project intended for the Milton Keynes Amateur Radio Society, hence the name.

The brief specification is an 80 metre phone transciever covering 3.5 - 3.8Mhz by means of a VFO. Power output is 5w pep. Sensitivity is <1uV with 4 poles of crystal filtering. Huff Puff VFO stabiliser. Liquid crystal display @ 25Hz resolution.

 

 

058

 

 

 

 

 

 

064

 

 

 

 

 

 

062

 

 

 

 

 

 


 

044

 

A design from G3TSO Mike Grierson. I built this circa 1990 and I remember that the tuning capacitor was very difficult to obtain at the time and probably still is.

It's an 80m SSB transceiver and is designed around an NE602 and an SL6700. RF output is around 10w from two cheap CB transistors  2SC1969's.

 

 

046

 

 

 

 

 

 

050

 

 

 

 

 

 

 


 

The Kingsdon Transmitter and Midney Receiver

068

 

The Kingsdon Transmitter and Midney Receiver for 40 metres. Boards and circuit designed by Tim Walford of Walford Electronics.

 

 

 

069

 

 

 

 

 

 

072

 

 

 

 

 

 


 

"The Malta"

016

 

"The Malta" a real favourite of mine. A QRP CW transceiver for 40 metres. Coverage is 7 - 7.07 Mhz. A Chebyshev ladder filter using low cost 10.240 crystals work well.

The whole casing uses the copper clad board style of construction.

 

 

023

 

 

 

 

 

 

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