Portable clifftop DXing

No updates for the last week as I was on holiday and out of internet contact. This last week I had a couple of chances to do some handheld SSB DXing with the FT817 from a Devon clifftop near Thurlestone. Although I think I stood a chance working LU2DO last night (I called and called and no-one else seemed to be hearing him), I did manage some European QSOs on 15m (HB9CVQ and a DL) and 6m SSB (IW0HLE) when running just 2.5W to a small whip antenna. I use an 8 foot long dangling wire counterpoise which helps a lot. On 6m I was just using the short helical supplied with the rig and only about 20cms long! Clifftop portable sites are magic with a decent low angle take-off, not that this matters so much with sporadic-E. In the past I've worked South America and the USA with handheld SSB.

IC7000 reliability

Some people have had issues with the reliability of the IC7000 driver transistor which gets too hot and can self-destruct. SV8YM has some modifications to help, putting improvised heatsinks on the effected devices so they run cooler. See his blog at http://sv8ym.blogspot.com/.  This is a rig I've considered purchasing but I have been concerned about the heat in such a small box and consequential reliability.

New 500kHz beacon in Norway LA1ASK/B

A temporary beacon LA1ASK/B will be operational during May until mid-June from the island of Toftöy near Bergen, Norway (locator JP20LL).  Frequency 509 kHz, mode A1A (CW), transmitter power 5 W to a 35 m vertical antenna. Reports to <post@bergenkringkaster.no> or QSL via the LA Bureau or direct, info at www.la1ask.no . 

30m QRP transceiver from GJ7RWT

Andy GJ7RWT has sent me his schematic for a 30m QRP CW transceiver which has some similarity to the XBM80-2 and the transceiver from K4TWJ. He gets 150mW out and the receiver can copy signals down to around 10uV. He has made the circuit on strip board (veroboard) and the layout he used is attached.

Further tests on 1kHz using conduction and induction

Today I continued "by ear" testing local induction and conduction communication using my 4W PA at 1kHz with 10m spaced grounded electrodes. Using the 80cm loop, HPF and audio amp I was able to achieve 0.3kms today, slightly less than on Monday. Everything else is unchanged, so I'm wondering if the effective TX loop area formed by the 2 earth rods in the ground changes with soil moisture? I.e. when the soil is damp is the loop smaller? Logically this makes sense. Copy using my 80cm loop and VLF up-converter was disappointing: I was unable to get further than 0.2km. This system needs further work as this should be every bit as good or better than the audio amp receiver.

Also today I checked the resistance of the TX grounded electrode system using an audio oscillator and potential divider method: it measures approximately 50-60 ohms from 1-10kHz, which is not too bad. I also tried receiving my signal 0.2km away using another pair of grounded electrodes spaced by 10m. Although copy was just possible, the signal was buried in mains hum. Mains hum pick-up on the loop is much lower. This again suggests that the main means of communication is induction, not conduction through the soil.

DK7FC's VLF PA

Stefan DK7FC posted the 300W PA used in his historic tests on 8.97kHz on the LF Reflector today. He's been copied by at least 10 stations in 5 countries using this PA with best DX 902kms.

4W TX for sub-9kHz experiments

Attached is a picture of the "transmitter" I'm using for my ground and induction communications tests. It uses a TDA2003 audio IC into a toroidal step-up transformer that can match from 10 to 150 ohms. Not sure of the transformer type which came from an old Pye Telecom PMR radio, possibly an M206, Whitehall or similar (it was used on the audio stages). I haven't yet tried listening with an active probe antenna to see how that would perform. Time is limited, so further tests may have to wait until the end of the month. Best range so far, receiving "by ear" on a loop antenna, with no clever selectivity or signal processing, is 0.35km.

VLF loop and up-converter ready for tests

This is a shot of my receiving loop antenna for sub-9kHz local earth-mode and induction comms testing. The loop consists of 30 turns of wire on a wooden frame. This feeds into my SBL1 based VLF-to-HF up-converter (the small blue box on the frame). The output of the converter feeds into the FT817 receiver.

Japanese Hamsat off to Venus

On May 17 Japan's Space Agency plans to launch a mission to Venus. It will also be carrying a 35cm cubed nano-satellite developed by universities and colleges. This nano-satellite will go into a Venus encounter trajectory and will become the world first university satellite which goes beyond the moon. It will perform technology experiments and test long-range, inter-planetary communication using amateur radio frequencies:

Downlink Frequency: 5840.000MHz, band width 20MHz
Transmission Power: 4.8W/antenna, 9.6W total
Antenna: 2 Microstrip patch antennas
Modulation: AFSK/FM 1200bps during LEO flight
CW 1bps during Interplanetary flight

DK7FC's 8.97kHz VLF grabber active antenna

DK7FC runs a grabber on 8.97kHz so he can monitor signals testing on this VLF frequency. He feeds the signal from this active antenna into his PC's soundcard. This is a sketch of the schematic that Stefan posted on the LF reflector today. He has since added some additional C between the drain and ground to reduce the intermod products from LW/MW broadcasters that otherwise produce a strong line on 9kHz.