I agree - well worth getting the paper version, if only to save getting a bad neck peering at a computer screen for hours. Andy G4JNT I have the paper edition of that book, courtesy of Analog Devices
And if the two coils were infinitely coupled, you would effectively have an auto transformer matching the transformed parallel equivalent resistance of the antenna to the desired load impedance. I've
Could I have a copy of the tapped coil design info pse. Can you send to my other account [email protected] as the firewall here gets a bit upset with .xls attachments Andy G4JNT www.scrbg.org
I thought things were getting a bit esoteric for this reflector. Came into the discussion part way through after reading a huge backlog of email after a holiday .... and you know how things are :-) D
My understanding of EMP Nuclear bombs - gained from documentation from the 1960s/70s, was that these were exo-atmospheric bursts designed to generate huge impulses at the ground due to Compton scatte
The 198kHz transmitter at Droitwich has four wires forming the vertical, with a four wire top hat. When I first put up my LF antenna I thought "they must know what they're doing" and copied the multi
If you're generating 1kW of real power, and feeding that into a -30dB antenna for your 1 Watt ERP, that gives 999 Watts of 'lost' power for you to extract and light up your bulb. Andy G4JNT (still lu
Not really microwaves and certainly not LF, but hopefully someone can help... I've been reminded that I promised to finish a 200 Watt 70MHz solid state PA, a project started some time ago and got put
OK, I'll switch it off this evening. I noticed at one point on Saturday, around mid-day, the GPS Rx briefly lost lock for a few seconds - presumbaly because the antenna view of the sky is blocked in
It is still going. Have you detected anything 137000000000000 nHz ~ 1mW EDRP Andy G4JNT --Original Message-- From: [email protected] [mailto:[email protected]] On Be
My Loc. - IO90IV I'll leave it running continuously as an attended beacon, unless requested to do otherwise. Andy G4JNT --Original Message-- From: [email protected] [mailto:owner-rsg
Somewhat belatedly, after a request from DJ8WX, I am transmitting a GPS locked carrier on 137000.0000000Hz so Uwe can test the Clicklock software. RF power is about 3 Watts which gives something like
Welll........ As as an isotrope is a point source, it must have one dimensional polarisation mustn't it :-} In reality, polarisation cannot be defined - a true omnidirectional radiator is (probably)
My Powerpoint presentation entitled "The Next Generation of Amateur Beacons for the 21st Centuary" given at the HF Convention on Saturday can be found at www.scrbg.org/g4jnt/ Andy G4JNT "The Informat
1960.000kHz +/- 1Hz. It transmits on the hour and every 15 minutes using the same format as the 5MHz beacons, ie callsign up to );)7 seconds, 6dB rducing power steps to 0:16s, power steps again to 0:
It should be, but the 'rule makers' way-back-when in their infinite wisdom decided that dipoles were easier for the humdrum public to visualise so defined ERP as being relative to a perfect dipole. A
It blasted out morse at me when I wen to this site and disturbed everyone in the office! The clock is still showing alpha time, and is about 1 second fast :-) Andy G4JNT Went to website. the clock is
More HF than LF, but I became very annoyed after reading it. Do these people not understand basic engineering? http://news.bbc.co.uk/1/hi/technology/6129460.stm Andy G4JNT "The Information contained
On my website www.scrbg.org/g4jnt/ I've placed a document (Beacon Timestamp) describing an idea for adding a three letter timestamp transmission to beacons that would allow verification of their rece
The Poldhu beacon on 1960kHz was turned on yesterday at 1415z Ironically, according to Keith G0WYS, the 144MHz beacon on that site, using the same callsign, has now failed - the PA has gone pop. Perh
