Dear valve/tube enthusiasts, Frank Philipse in the Netherlands has made a hobby out of collecting tube data sheets. His web site has >20000 (!) data sheets avaliable for download. www.tubedata.org Pr
That list of sensitive words almost certainly needs to be taken with a pinch of salt. Yes, and English is not the only language used in electronic communication... 73 Johan SM6LKM
I have been looking into JT65, and its earlier incarnation JT44, in some depth recently for use on beacons. It is very amenable to being generated in a simple driver based around a DDS chip. I don't
Mal, regarding class E, the best paper I have ever seen is "Class-E RF Power Amplifiers" by Nathan O. Sokal, WA1HQC. The author is one of the inventors of class E. It was published in Jan/Feb QEX 200
Hello Mal, [...] all those mf values seem very high in the Tonne design. Yes, I also got strange results out of Tonne's program until I realised that I had to be careful with the units of input data.
Hi Mal, I wrote a tiny DOS program for transformer design a few years ago. (it will happily run in a "DOS bubble" under window$ too) The program is attached, including source code. I hope it is corr
Yes, I have been using the 150mm (6") pipe in our well with quite good results. The pipe is 12m long and goes about 11 m (36ft) through soil and about 1m into the granite rock below (total hole depth
Warren, BBC 4 from Droitwich on 198 kHz is kept in very close tolerance by the NPL. http://www.npl.co.uk/time/droitwich_bulletin.html Yes, but it is not so easy to use "right out of the box" because
Hi Mike, the 2N508 seems to be ideally suited for use in amateur LF rigs as it said to be specifically designed for "entertainment equipment" ;-) Data from 1975 vintage Motorola books: 2N1309 "PNP ge
The Danish station on 243kHz is "quite" spot on (as is their 1062kHz medium wave TX). These transmitters are said to be checked against some national danish standard and should be within 10E-10 or be
Bernt "Gus" SM6BHZ asked me to QSP this msg to the list because his own attempts to post here has failed. He will be beaconing a couple of hours tonight on 505.06 kHz starting 2200 UTC. Mode is QRSS-
Hi, Version 0.5 of SAQrx is now available at: http://home.swipnet.se/sm6lkm/saqrx/saqrx.html - Three selectable filter bandwidths, 300, 1000 and 2400 Hz. - 1 Hz tuning steps. - CPU load indicator. -
Hello, If you want a soundcard VLF receiver dedicated for SAQ reception, look at: http://home.swipnet.se/sm6lkm/saqrx/saqrx.html It can't compete with Winrad or SpecLab, of course, but it is easy to
Yes, but SAQrx uses a complex FIR filter for the main selectivity so it will take some CPU power if you want: 1. narrow passband width AND... 2. small ripple in the passband AND... 3. steep skirts AN
Yes ;-) it came with the Dev-C++ compiler... I am having a hard time trying to figure out how to make that icon appear in the top left corner of the window and in the task switching window (Alt+Tab).
Yes, I am using a small relay in my E-probe antenna. It connects the whip to ground when power is removed. I did not notice any change in sensitivity after adding the relay (although I did not measur
Hi, version 7 of the free circuit simulation program "Tina-TI" was released a few days ago: http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html This version has a lot more SPICE models than th
