Yes! when checking the cathode compartment of high power tube amps I clip on a capacitance meter and run around the caps with a soldering iron to heat them up. Caps at room temp seem fine but the odd

I'm running the development version of 1.7: http://physics.princeton.edu/pulsar/K1JT/wsjtx-1.7.0-devel-win32.exe There are linux and Mac versions also. Mark G0MGX

Thanks to all who have replied. 1st I will try and make one - I have ordered some suitable caps. 2nd I have found some used SSB DCW-15B sequencers - listed as 70cm but they may work at 23cm - they are

Some HP/Agilent/Keysight impedance analyzers can use a high Q capacitor during the calibration procedure. This is an optional addition to the short, open and 50 Ohm load which are are mandatory. My

Guess so, but a 4.7uF air-spaced cap with a 1mm gap needs plates about 25 metres in diameter, leading to some amusing complexities of construction. I am now wondering what the effect of

Hmmm. I guess air as a dielectric is not quite so tricky. Paul G8AQA

Also there is a time-varying effect on capacitance when a step of charge is added to or taken out of a capacitor, with dielectric absorption of up to a couple of percent in X7Rs leading to

Hello group, I am looking for a NC405 noise diode . Who has one and do not use or where can i buy it cheap ? Thank you for reply .... 73 John PA7JB

Interesting stuff about capacitors. Temperature and Voltage Variation of Ceramic Capacitors, or Why Your 4.7µF Capacitor Becomes a 0.33µF Capacitor - Tutorial - Maxim

I have a Leica surveyors tripod for my 3cm /P kit and had a camera pan/tilt head fail in the summer. I'm intrigued by the simplicity and cost of these units and possibilities. Also keen to

Hmm, never seen these before, but there is a whole range of them on the Bay. Some of them look quite suitable. Thanks for the spot. 73 Geoff ################################################# Geoff

Pretty certain Mark that Kuhne Bias Tees are QRP level intended for Rx rather than Tx? Have a look for DCW2004B from SSB Electronics, will take 150W but is not a cheap option if you don’t want to

No Joy with B&Q online but this guy does a number of sizes. I have bought a 4 inch to evaluate. eBay item number: 131946474499 Paul G8AQA

I use dc feed wire to the preamp. Huprf do bus tees. Just Google huprf. 73 John

 Hi Geoff, Sorry to hear you are having problems. I have searched on the main B&Q website andcannot find them there either... I have contacted B&Q with the code no andasked if they are available

how about one of these ? eBay Link £ 2.13 4" Lazy Susan Bearing Heavy Duty Swivel Turntable Plate For TV Rack De... You should receive item within 3-5

Maybe I was a bit premature, I searched the local B&Q and not a sign of such. Could fellow ops, when they visit their local B&Q have a looksee if they have any in stock, and email me. I then can

Hi All Thanks for all the help both by the reflector and direct. I think I now have all I need and very useful information it is too. To Andy re vid clip...yes please if we may use it as an example on

Make one An ATC 100pF cap with its trusted current /. voltage will give you plenty of power rating For preamp power, any small choke around 50nH will do. A few turns of thin wire a few mm diameter.

Hi All Icame across a TS-2000X yesterday and brought it home with me. I plan to add aHUPRF PAT board so I have a 23cm panoramic SDR thingamabob. My question is overpowering my masthead 23cm preamp -