Edinburgh Hacklab

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====== Radio Projects ======

There are a number of projects in the pipeline relating to amateur radio; these will be updated as they progress.

===== Lab Radios =====

The lab currently has the following radios:
  * Icom IC-761. HF Transceiver. Modified for use with external power supply as internal broke.
  * Yaesu FT-757GX (HF)
  * Yaesu 7900R/E (V/UHF) (Loan from Ben C.)

==== Amplifiers ====

There is a 2M Linear amplifier, "The Polar Electronic Developments EDL144" donated by Colin. Notes on it copied from his email follow.

https://worldradiohistory.com/hd2/IDX-UK/Amateur-SW/Archive-Short-Wave-Magazine-UK-IDX/IDX/70s/SWM-1977-02-IDX-20.pdf

It has a cool old power valve inside - http://www.r-type.org/exhib/aag0119.htm I think.

I found details, and circuit diagram here: https://www.g1ogy.com/qqv-0640.html

Better photographs of the inside are here: https://pa0fri.home.xs4all.nl/Lineairs/EDL144/EDL144%202m%20amplifier.htm

He (Colin's Dad) would have used it with an Icom IC-211E radio which (from memory) had a 10w output - I think the amplifier produced maybe around 100w or so, but this is from old memory so take with a pinch of salt.

I suspect it could be modified to work on HF - e.g. http://www.zl1bjq.co.nz/qqe06p2.html or http://www.vk3nx.com/files/50MHzAmp.pdf

It probably hasn’t been powered up since 1981 or so - so no idea what condition it might be in - but it might be interesting for radio folks (assuming there’s a large enough dummy load!). Alternatively, if it’s not suitable for hacklab and anybody wants it please feel free to take it, or add it to the ‘dispose’ list.

But - high voltage, high power valve stuff = dangerous so be qualified.

Regards,

Colin

"This linear amplifier for 144MHz employs a rugged push-pull tetrode operating in AB2 for the linear amplification of transmitters in the 10-20 watt range. A single stage dual gate mos-fet pre-amplifier is also fitted to enhance the performance on receive. This has variable gain, which is accomplished by varying the potential on gate 2. This produces a gain of approximately 20db in the  maximum gain setting. Under strong adjacent channel signal conditions it may be necessary to reduce the gain to prevent cross-modulation effects in the associated receiver. R.F. input and Antenna connectors are the familiar S0-239 and are mounted on the rear panel and clearly marked. Also mounted on the rear panel are the bias control potentiometer and the mains fuse."

==== Antennas ====

The lab currently has the following antennae (for transmitting):
  * Off centre v-shape HF Dipole, this is mostly tuned for 40m/20m
  * V/UHF Double J-Pole

There are various other antennae on the roof for SDR and ADSB purposes. Details about these can be found on the [[:roof|roof]] page




===== Other Projects =====
  * [[https://radio.ehlab.uk/|radio.ehlab.uk]]
  * [[sdr|SDR]]
  * RX/TX iGate - requires NoV - [[http://aprs.fi/info/a/2M0FFY|this is available]] for the time being for anyone who wants to mess about with APRS.
  * WSPR/QRSS?