VLF E-field probe design from DK7FC

DK7FC's VLF E-field probe antenna

Stefan DK7FC is well known for his experiments at VLF. Here is his circuit for the E-field probe he designed which is in use at many VLF grabbers around Europe. It is highly recommended.

Further 481THz G4HJW reception "over the horizon"

G4HJW received on 481THz over an 8.63km non line-of-sight path

Bernie G4HJW was 20dB S/N in 0.67Hz bandwidth earlier this evening at my local test site 8.63km NLOS from his QTH "over the horizon". Bernie was using his Phlatlight beacon with 1.082kHz tone. The sky was clear and starlit, so this was clear air scattering not cloudbounce.  About 15 minutes after I first copied him it seemed to get more hazy and I was struggling to find his signal at all.  Best results appear to be with a clear sky and aiming at the horizon. 

On 3 attempts copying G4HJW's optical signal it has been (1) 30dB S/N, (2) no copy and (3) today 20dB S/N in 0.67Hz bandwidth over an 8.63km NLOS path. I am still using the BPW34 detector in 100mm optics.

160m JT65 QSO with loft vertical

JT65 QSO with 2E0ZRQ this evening on 160m

Managed to work 2E0ZRQ who was running 20W to a longwire with my 5W to the tiny loft vertical antenna this evening on JT65-HF. This is my first QSO with this mode on topband at a distance of 148km.

160m loft antenna diagram

This is a diagram showing the arrangement of my 160m loft-mounted antenna. The ground connection is made to a hot water tank (copper) next to the upstairs shack. It connects via copper pipes in the house to the external ground and works very well. The top capacity hat should be as large as possible but in my case is just a couple of horizontal wires around 1-2m longh in each case hung horizontally in the top of the loft space.

160m JT65

My 4 year old grandson having gone home now, I have my shack back again so am able to play amateur radio again. I've several things to catch up on including:

1. Trying for a first 160m JT65 QSO.
2. Measuring the performance of my ST-3 JRC headphones that AA1TJ managed to find for me recently.
3. Another over-the-horizon 481THz test looking for G4HJW's beacon and my own.
4. Testing my iPod Touch SpectrumView application with an external audio input.

This evening I have been copied by G4HPW (87km) on JT65 on 160m but no 2-way QSOs with this mode are in the log yet on topband using my compact loft antenna.

10m good despite the flare

Today all the propagation forecasts were showing poor conditions on HF. Despite this, 10m was well open this afternoon to the Middle East, Africa and South America with good signals received. My only QSO so far has been with JY5HX when running 5W CW here.

The lower part of 10m had several Russian (?) CB stations including one operating almost on 28.060MHz, the CW QRP frequency. Use it or lose it folks.

160m JT65

As I appear to be having some success with WSPR on topband, I have decided to try JT65 on the band to see if I can manage a few QSOs.

UPDATE: after calling for around 15 minutes I gave up!

My 160m WSPR analysis

Since erecting my tiny 160m loft mounted vertical this last weekend I've used it on WSPR a few evenings with great success. The following tables show the unique reports received and sent on the band using (mostly) 5W. Most stations copying me can be copied here, despite the horrendous noise issues on the band at night.

160m WSPR reports received

160m WSPR reports given

So far, reports have been received from 9 countries with best DX being 1007km. Not bad with an antenna which is essentially a 1m long coil, a couple of top capacity wires and about 3m of feed wire from the loft to the upstairs shack and tuned against my central heating system copper pipes as a ground.

Elecraft KX3 manual

The soon to be released KX3 QRP transceiver

The preliminary version of the owner's manual for the latest Elecraft KX3 12W all mode 160-6m SDR portable transceiver is now available. The product is expected to ship very shortly now. Reading the manual it is clear this is a VERY impressive radio packed with features and facilities. Initial reports from field testers confirm performance of this little radio is up there with the very best, and all this in a size not much bigger than the control head of an IC703.

VLF test by OE3GHB

OE3GHB's VLF loading coil and transmitter

OE3GHB has reported on his 8.97kHz VLF tests this weekend. He was copied by several stations in W.Europe. Gerhard's signal was clearly detected by OK2BVG, DF6NM, DK7FC and by Paul Nicholson in Todmorden. There was a trace seen by G3ZJO. At the moment my VLF system is out of action so I was unable to take a look. The picture shows Gerhard's enormous VLF loading coil. Antenna current was around 600mA and his antenna was a vertical on an 18m fibre glass pole with a 100m horizontal top wire with 600pF capacitance.