I have, for quite a while, provided modified versions of the code for my projects free of charge. However, the cost of webhosting for this site has tripled in the last couple of years and the little I make out of the pcbs I sell goes nowhere near covering this cost.
As of October 2017, I will be asking for a donation in exchange for providing custom modified code for my projects to help keep this site available.
Updated Australian Band Plan page with the latest info (under 'Misc' heading).
A modification plus software to allow the Simple DDS VFO to be re-calibrated as often as you want without having to re-program the PIC has been added to the Simple DDS VFO page. Simple DDS VFO bug problem fixed. Code uploaded to webpage as version 'c'.
There is a bug in the Simple DDS VFO code. See Simple DDS VFO page for the problem and updated code. Included an add-on for the Simple VFO project to indicate which step size has been selected. Simple DDS VFO project updated and software file uploaded. The pushbutton on the encoder is used to change step size (step sizes 10Hz, 1kHz and 10kHz).
Noise Canceller kits now available.
Updated both the DDS Xtal Substitute and DDS Xtal Substitute Mark 2 projects into one project. The original webpages are available to download as PDF's.
New project added - my version of the X-Phase noise canceller. PCB available and a kit of parts to follow soon
Some photo's of the equipment in the shack. First up, an FT7. Considered to be a fine rig in it's time when it came out in the late 1970's. I haven't fired this one up yet, so I have no idea what condition it is in operationally. Cosmetically, it's not too bad, but then nobody can see it over radio, can they.
Next up is an FT757GX. From it's serial number, it is one of the very first one's from circa 1983. I bought this one cheap with a receive problem according to the previous owner. Why did I buy it with a fault? Well, one of my activities is PIC programming, so I want to look into doing a replacement cpu for this rig at some stage.
The fault is supposed to be that it drops out on receive occasionally but tx is fine. Most likely causes of this (in no particular order), faulty/aging xtals, faulty trim-caps in the oscillators and a very common one, faulty diodes (this model uses diode switching instead of relays for much of it's rf switching). There are relays used for power switching and it's possible one of these is faulty. On the test equipment side of things, I have a Marconi TF2015 signal generator, a CTE 1gHz spectrum analyser, UNI-T 100MHz digital storage scope and various multimeters on the commercial side. Amongst the homebrew test equipment, there is an LC meter built from information on the net, an RF Powermeter designed by OZ2PU and published in Elektor magazine, various frequency counters and a valve/tube GDO.
Marconi TF2015 signal generator. 10MHz - 500MHz range.
CTE spectrum analyser. This unit has internal batteries so that it can be used in the field. All I can say is, you need muscles upon muscles to cart this any significant distance. It is a really heavy brute with batteries in.
The LC meter built from information on the 'net. 16F628 PIC based.
OZ2PU RF Powermeter. Contains an AD8307 and 16F876 and good to approx 500MHz.
As you can see, the GDO is complete but in pretty rough condition. I'm still debating whether to power it up or not (after doing the necessary safety checks, of course).