#495

[@allenmarian2005]

IMSAI Guy, your videos are gold mine. Every video deserves to be downloaded and archived.

[@californiakayaker]

I've got a very old one, produced by motorola by someone and sold as part of their required test equipment in the 70s. 26as101-1 One way I use it is to run it directly to a dummy load, and put an atenuator on the sample input/output, and a sig gen on that. I can measure receiver sensitivity without having to worry about tx. blowing the test gen.

[@kingsman428]

*"... What's this thing?..."* Looks like the kind of thing that Gerry Anderson would use as a model in Thunderbirds, Captain Scarlet or UFO

[@Creatortech95]

please make a video about RF amplifier Phase maching and power combining

[@IMSAIGuy]

I have some already, search my channel for amplifier and splitter (used backward for combining)

[@Creatortech95]

@@IMSAIGuy please tell me Can we use Vector Network Anylizer for phase maching And I have 2kw Rf amplifier wih 8to 1 combiner all rf amplifier have more than 1.5kw individual out put power but when i connect these amplifier to cmobiner it output show less than 4kw is it happen with phse maching error or impedance maching Amplifier range is 1250mhz to 1350mhz pulse amplifier

[@IMSAIGuy]

@@Creatortech95 that is a large system and not all can be measured with a VNA, but certainly you can measure things like the electrical length of the different paths, the %transmission of things, and the SWR at various points. Since it it portable, measurements at the antenna are possible. all the measurements are done at milliwatt powers so it will not account for loss do to high power. I don't have any real experience.

[@Creatortech95]

@@IMSAIGuy thanks this module use for Radar and it is tha finel out of 10kw if the total output more than 8kw then we can switch on CFA and it power up to 100kw this is old military radar can i know what is tha basic instrument use for pahse matching We have Vector Network anylizer ,signal anylizer , oscilascope powermeter frequency counters And yesterday i power the amplifier and use vna with ratio b1 /b2 and use attenuater and coupllers to reduce output power to -10dbm because vna cant handle too high power Then frequency genadator out certain frequency but the vna show it varied highly. -30 dgree to 160dgree. So i remove amplifier and connct vna to signal genarator with coupler but it show phase angel pin point

[@johnwest7993]

While that 50 terminator may never be removed, if you wanted to analyze a 75 Ohm cable you can just replace the 50 Ohm terminator with a 75 Ohm terminator and the coupler will work just fine at the new impedance.

[@W1RMD]

Could one be made for 300 ohms?

[@AECRADIO1]

The 20dB is for the coupled port. The load is for the coupled port, pre-set impedance. The dB rating comes from the coupled port distance from the main line. X input, coupled to sample port 20dB lower level.

[@IMSAIGuy]

Thanks. that makes perfect sense

[@vidasvv]

Nice tutorial about couplers. What rev firmware are you using on your NANO ? 73 N8AUM

[@IMSAIGuy]

Feb 23 2020

[@vidasvv]

@@IMSAIGuy TNX 4 reply

[@andrelubbock]

Thanks - interesting. It's a shame we can't see connections to the coupler while dong noise floor measurements .

[@IMSAIGuy]

CH1 connected directly to 50ohm load. no input to the nano

[@Tchipo100]

Fantastisch simple explanation of difficult things ! Tex vo much ! On4 SG

[@Flamenawer]

What you did in the last part to measure the noise floor, and why? It cannot be seen and you don't explain so only you know it,.or someone that knows already,.but that people dont see this videos. Please, explain more the things your videos interest me but always there is important points that just get lost by the cameras or other reasons. explain what is seen in the screen s11? S21?

[@IMSAIGuy]

I have a playlist 'nanovna' I think there are 60 video for you to learn from

[@Flamenawer]

@@IMSAIGuy thanks by made them

[@W8ASA]

Not 50MHz-2.4GHz. Their published data sheet shows 500MHz to 2 GHz.

[@IMSAIGuy]

I said it right at 15:44 then messed up at the end

[@WiteexLC]

Its look like ANAREN brand coupler.

[@Flamenawer]

Yeah. , The color is that

[@Peter-W1]

500 MHz to 2 GHz otherwise perfect video next up maybe a circulator if you have one 👍😎

[@IMSAIGuy]

No I don't have one. Do they operate below 1GHz?

[@W8ASA]

@@IMSAIGuy Yes, circulators work down into the MHz region.

[@glasslinger]

@@IMSAIGuy If you find some of the older cell phones that had a black box full of electronics there are several circulators that operate in the 800mhz region.