To All from PA0SE In my report on signals received over the weekend 27/28 January I mentioned that reception was hampered by noise from a local electric appliance. Last weekend the noise was there ag
Uwe and All, PVC is certainly good enough at LF. When you want to be sure put a piece of pipe in the microwave oven (together with a glass of water as dummy load). When it survives that test you know
According to one of my books the dielectric constant of PVC is 3.5. 73, Dick, PA0SE Hi group, is there any who knows or can look up the - ah I do`nt know the correct word - elecric property constant
To All from PA0SE Radio station Kootwijk in The Netherlands is being dismantled (that is were the "PA0SE aerial insulators" came from; I still have some). At the point of being scrapped now is a spoo
To All from PA0SE I think it was known as an EF54? You are right! In a list of equivalent valves I found VR136 = RL7 And then in another list RL7 = EF54. Thanks Robin! 73, Dick, PA0SE -- Original Mes
To All from PA0SE That's my memory too - i.e. the red or aluminium cans were EF50s. Why some were red I don't think I ever knew. _______________________________________________________ Is it not so t
To All from PA0SE The red metal valve must have been an EF50. 73, Dick, PA0SE Alan is right,when I was at Hanslope I saw the 807 distribution amps and also some using EF80s the red metal case valve .
To All from PA0SE I worked OK1BTN on 25 February; sent 569, received 229. Heard G3YXM and ON6ND working him as well. 73, Dick, PA0SE Further to yesterday's message about hearing OK1DRT. I worked him
To All from PA0SE I have a single-turn delta loop of 65 m perimeter, and also find it excellent for receive. It is fed at the top using balanced feeder and is tuned & matched to 50 ohms with a balanc
To All from PA0SE I will be presenting a talk entitled '136 kHz DXing From A Small Back Garden' to the members of the Trowbridge & District Amateur Radio Club at 8.00pm on May 2nd. It will be the fir
To All from PA0SE Many thanks to those who gave me their views on the matter of FETs versus bipolar transistors in LF transmitters. I now understand why at unpredictable moments one of the four HEXFE
To All from PA0SE GBR came in with a very strong signal on 16kHz. At 1200 GMT I received the following text: v v v de gbr v v v de gbr vvv de gbr attention all ships and submarines this is a special
To All from PA0SE Most of the designs for high power transmitters for the LF bands I have seen use power-FETs in the final. Examples are the designs by G0MRF and G3YXM in The low frequency experiment
To All from PA0SE, Steve, GW4ALG, wrote: Beaconing might have been useful in the early days, but it was, and remains, a potential source of QRM for many experimenters. Beaconing is an inappropriate u
To All from PA0SE an increased capacitance from a vacuum variable has lower losses than the "antenna circuit" but it is a reasonable approximation for gathering measured data. What about replacing th
To All from PA0SE At the risk of boring you even more I report the result of another experiment I made on my loading coil. To avoid disasters I replaced the transmitter by an old Rohde & Schwarz valv
My first reaction to this IS one of surprise. My first thoughts are that in a series resonant circuit (the loading coil in series with antenna capacitance and system resistance) the loop current wou
To Bob, ZL2CA and others from PA0SE You did not comment on the phase at the hot end of the coil compared to the cold end. I cannot measure the phase difference between currents in and out of the coil
To All from PA0SE But these harmonic currents will upset your readings somewhat - where on a scope trace is the RMS value of a) the total waveform and b) the fundamental ? The harmonic currents will
