Hi Murray 50mW eh, sounds like it was a good idea that when I checked the output freq range I fed it through a 20dB attenuator. (My pre-scaler is only rated for 20mW input). Thanks for the info -

Confuses my fellow students as well, they cannotintuitively understand how if the aperture of a horn or parabolic antennagets larger that the beamwidth gets smaller. They had better hurry up and

Hans I was trying to have a day off from this, I have anexam on antennas and mobile propagation in early January! Interestingly the selfsame conundrum was posed to us. The only error that I could see

its never mentioned either everyone phase mod (or thereabouts as the not see the phase mod if you simply put just follow the signal. You must externally as an xy lisajoe display you can time

frequency crystals at a a price of £67 while back Dr OM, As those 198 kHz xtals are virtually unavailaBLE, my friend PA0JHC uses a pll filter on 198 kHz ( with an S042P mixer IC ) as front in his

SPOT ON ! Antenna-gain and antenna-aperture, and how theseare used in link budget calculations really confuses many non RF types. Andy

I doubt we have a manual, but I remember buying a new 86245 nearly 20yrs ago from HP for satcomms work - they are a bit special... If its anwhere near original spec it will give a guaranteed

Hi John, Yes there was some debate about that. But on the other hand if he had used all vacuum devices - it wouldn't be a clock - it would be a cabin heater! All the best David

Hi John Yes I'd forgotten - again! The phase modulation was used to switch electricity supply timeswitches/metering rates for off-peak supplies. I was involved with some early discussions on that in

Somemore "explanation" (or confusion) of the proposition ofAndy: 1) "RF transmission path loss increases with frequency." Formula ofRiis: Conclusion(1): it looks very stupid

But it uses silicon diodes in many places rather than vacuum diodes - surely some mistake! 73 John

Hi Geoff If you have a nostalgia for valve based equipment have a look at the nixie time standard clock this guy has built. I recon it's just about the most complex valve based clock I've

Hi All Just acquired the above equipment and looking for 1. Operating and service manual for the Ailtech 75 series PANFI 7511C - it has an RF stage and presumably a mixer but don't yet know the

David, A large part of a lifetime ago, I had the dubious priviledge of maintaining the distributed standard frequency system of a (then) large research labs near here. The prime mover was two

I'm also interested in radio controlled electric flying models and buy a number of magazines associated with this hobby too. What a breath of fresh air they are. They try to cater for the novice

Hi Eric Thanks for the reply at the moment i do not have any info on these items so i would like to take up your offer and would be greatfull for any info. 73 Simon can "scan" it for you 2/89 ) about

Hi Malcolm, £67 + VAT is outrageous. If you wanted a 60KHz crystal it would be less than £10. We had this problem a few years ago and Mike Scott designed a trf receiver using several TOKO tuned

Yes Alan The point you make, I learnt from an older lecturer a long time ago when I taught part time in a technical college - the best teachers are those who understand the problems of their students

Hi folks Well I just picked up a copy of Everyday Practical Electronics for £3.30 from our local Billy Smiths. They also had Practical Wireless - but I resisted that. The content of PEE is good