Please see below. Can anyone identify the military radio referred to? Regards, John Rabson Editor Cave Radio and Electronics Journal I met someone from the Black Sheep Diggers yesterday at the Inglet
Dick, Many thanks for the reference. You are not off topic. Cave radio makes extensive use of LF, although not on amateur frequencies and the references you give look very interesting. In Europe we p
I have looked at the NoV and other documentation received from the RA. It seems to be silent regarding any crossband working with amateurs in the normal amateur bands. On the other hand, paragraph (b
This was a body-worn radio system intended for firefighters working in steel framed buildings. I understand it was tried at the Moorgate Underground disaster in 1975. Does anyone have any information
The conditions for portable operation on 73k are that you have to inform the RA some time in advance of your /P location and other details of the operation - but this is just a formality. They will w
My NOV says /P OK if you notify local RA a few days beforehand. John Hi all John has just raised an interesting point about 73kHz NoVs....mind you operation would have to be from your location John .
I live in Wye, near Ashford, Kent J001LE ... why ?(!) If you had been nearer to me (Eyke, Suffolk) we could have considered operating /P from somewhere convenient to both of us. 73 John G3PAI
I think the RA stopped issuing NOVs for 73 kHz some time ago. Whereabouts in the country are you please? 73 John Rabson G3PAI Hi all, Does anyone know if the RA is still issuing NOV's to use the 73kH
I believe the Hallicrafters used several pairs of lightly coupled tuned circuits. The 1960s receiver, a GEC RC411, had crystal filters. There is of course another advantage to the thermionic device.
A few years ago, I was restoring an ancient Hallicrafters receiver and noticed the crisp quality of the audio compared with that of a 1960s transistorised communications receiver. I spoke to one of t
Go for several routes. There's nothing to say we have to stick to one: 1 national society magazines such as RadCom and Radio REF 2 this reflector 3 specialist periodicals such as Sprat 4 Practical Wi
I have had a request from a group of cave divers for an alternative to a conventional handset for this radio. An ordinary mike/loudspeaker setup is not ideal when one has come up for air and is still
As well as: 2. HF in 2003 c. Amateur radio at HF I note also: 4. Detailed Scope g. Related Systems and Techniques i. VLF - MF services, systems and techniques Regards, John Rabson G3PAI Editor Cave R
Rik said: It may help if you can turn off any other software (don't forget all the stuff that is started when you launch Windows). There seems to be an awful lot of this on my machine (if I type CTRL
One final point, if you doing the ADSL setup yourself. The North American ADSL/HDSL systems are largely line powered. It takes a major effort to deliver 1W of DC to the far end of a long local loop
The Swedes? John Rabson G3PAI Isn't the most logical one YYYY/MM/dd ? Does anyone use this format routinely ? Andy G4JNT -- Original Message -- From: Dexter McIntyre <[email protected]> To: <rsgb_lf_
I observe that the working language of this news reflector is a set of generally mutually intelligible forms of English (American, British, Australian or whatever). I also see that from time to time
The author seems to be confusing "interference" in the sense a physicist would use the term (that is, interaction between photons or electromagnetic waves in a fundamental sense) and the sense in whi
