A Grampian parabolic reflector as used by the Beeb where one was attached to the Pavilion at Lords for many years, I wasn't a sound man but I recall being told they kept it in preference to more moder

Martin I can't be certain about the specific part number but we used similar relays from the same company in the broadcast industry as outgoing transmission switchers and emergency changeover switches

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Conrad I was about to suggest it may be 60 Hz, don't forget that turning off the monitor tells the display card there's nothing connected via the HDMI HPD line (hot plug detect) and nether does the mo

Conrad I thought of Indium Tin oxide coated glass and came across this company:- http://www.visionteksystems.co.uk/index.htm John MW1FGQ

Andy This has been mentioned previously - you can get copper plated studs intended to be spot welded e.g Ebay 331921430642 The head is flat with a raised pip and I guess the plating is thin but they'r

Andy G1HBE, a friend not on this group, is selling one of his Spectrum Analysers:- "For sale: One Rigol spectrum analyser, type DSA1030a-TG. Excellent condx and full working order with all shipping ma

I once idly played with a plastic lens in front of the feed horn of a dish at 10 GHz to see if it would broaden the beam, it did have an effect although I didn't pursue it. The 3" lens was from a very

Hi To strip semi rigid cable I use a pair of Ideal T-strippers such as:- http://cpc.farnell.com/ideal/45-125-341/metric-wire-stripper-0-5mm-to/dp/TL00596 I grip the semi rigid at the top or smaller di

Hi Martyn Thanks for the encouragement, I'll do my best but the wheels grind exceedingly slowly around here, I'll definitely put 24 GHz on the list but it's dependent on work/money etc. I'll make a st

Mark and Chris Thanks both for your informative replies, I may well make a start on my 24 Ghz system this year and will no doubt be back to ask more questions about it! Whilst I'm on - has anyone made

Mark Not a solution but a question for my own education:- Would a length of suitable semi rigid cable make a useable dissipative attenuator at 24 GHz that could be reliably calibrated? I see that some

Martin Does this add anything to the information you have? HP/AGILENT QMXR-5993 Mixer, RF/LO=1.6-4.3 GHz, LO=+10 dBm, IF=DC-1 GHz, SMA(f/f/f) John MW1FGQ

Dennis Full details including alignment are in VHF Communications 2/1989 for the XLO-1 and 3/1989 for the XRM-1 and the XTM-1 under the headings "Microline 3, 10GHz Transverter" by DC0DA, I have them

Conrad I have the same transverter here although it's in a bit of a sorry state at the moment. An article in the old ARRL UHF/Microwave Projects book by WA5VJB mentions a difficulty in getting enough

Norman I would guess the size of the resonator would put it around 2 - 2.5 GHz, I have a similar size one in an old CML 24 GHz video link although mine has a separate isolated tuning line with a varic

Conrad Have you looked at RS Designspark? I've just downloaded it and checked that it imports DXF and outputs Gerber so it should do what you want, I'm not a PCB designerr so please let us know if it

Martin From my experience some years ago with two BT broadband accounts I think the problem is probably communication between TakTalk and BT Openreach who are the "non customer facing" branch that loo

Dave From my recollection you'll have to saw through about 1/4" of glass reinforced plastic to open the box. I was given one by a rally trader many years ago when neither he nor I knew what they were,

All I'm hearing a weak slow beacon or perhaps data type signal on 144.175 MHz, I first heard it on Saturday when I listened briefly but it's still there today. I'm only listening on a simple vertical