The devices I used for the experimental tell-back contacts are in stupidly tiny packages (X2SON) which are 1.1 x 1.4 mm, a fraction of the size of an SOT23, but they also come in GIGANTIC

Wonder if a peak and hold injector driver (LM1949 springs to mind) scheme would work for this. -- Clint. M0UAW IO83 No trees were harmed in the sending of this mail. However, a large number of

Thanks for the info Pete, I'd have to get a "little helper" with that project, I've not got into Arduino's yet. I know I should they do look so usefull. I would think a PIC would also do the job, i

Thanks Kent. That's my thinking, using a relay "speed up circuit" the prolonged on load volts is a lot lower than the instantaneous voltage. therefore not damaging the transfer relay. Nick G0HIK

That looks spot on, I wonder if I can make a "Fat Finger" version, (Non SMD) and using component type I've heard off, I'm so way out of touch with those parts. I see hupRF used to supply a kit to do

I run a separate 28V relay supply into the masthead boxes and pulse the latching relays with an optoisolated control signal, but they all have tellback contacts which are linked to the

Deep Sigh........... :-( :-( :-( That word, Chinese............ Followed by useless / failed / fake or some such word The Simple Switcher family of ICs are so easy to use, just a handful of components

I have several Transco 'Y's in my EME system for nearly 40 years that do pull quite a bit of power. I power them with a voltage doubler circuit. No Load Voltage is high, several volts above

Yes Ben, My relays pull current all the time, I was wondering if damage might occur leaving power on them. Although using the pulse circuit leaves 12v on them it's half the current. I presume there

David: thanks for the 2 mount ideas, loved the simplicity. I am a retired comms engineer and always over engineer things, worked for the space warfare command and that is the way uncle sam wanted

Thanks Clint. Off to the shed. Ben - Sent: Fri, 30 Oct 2020 12:25 Subject: Re: [UKMicrowaves] Surveyors tripod thread Wikipedia suggests 5/8" 11tpi https://en.wikipedia.org/wiki/Tripod_(surveying) --

Subject: Re: [UKMicrowaves] 10Ghz last night Ben,Here's something to consider .... http://www.bigskyspaces.com/w7gj/HingedMount.pdf _._,_._,_ I like that David. Indeed, if you make the front of

Ben, Here's something to consider .... http://www.bigskyspaces.com/w7gj/HingedMount.pdf

Probably a rather obvious suggestion but does that label hide a screw or two? Paul

Wikipedia suggests 5/8" 11tpi https://en.wikipedia.org/wiki/Tripod_(surveying) -- Clint. M0UAW IO83 No trees were harmed in the sending of this mail. However, a large number of electrons were greatly

What was the thread on the locking screw on these surveyors tripods? Need to start making the mount for it. Ben

Andy. for 2.3 GHz portable I use the WIMO /SHF antennas 40 element Yagi. https://www.wimo.com/en/antennas/vhf-uhf-shf-antennas/stationary-directional-antennas-yagi-x-quad/shf-1340 They make longer

Hi Doug ..... firstly , assume nothing . Accept what you know ...... and what you do not know . It looks a little aincient (?) , and I can't say that I've ever taken an avantek amp apart .........

If I had to guess, I would say the being driven hard has blown a resistor or inductor feeding the FET. In my experience, when FET's fail, they tend to fail short circuit, so I think it more likely

Greetings to all readers! I am wondering please if someone reading this message has practical experience with the internal construction and circuitry of AVANTEK microwave amplifier