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Low cost/Field Day HF test bench concept


 

I'm assembling the following suite of test kit just to see what it can do for radio design work. After evaluating the performance relative to my mid 90's HP & Tek kit, I plan to use this kit to do various exercises such as design an amplifier, oscillator, filter, etc and measure the performance.

For most of my life my RF ambitions were stymied by the lack of access to test gear. So for me, the nanoVNA and tinySA are huge. I have decided to make a project of building out the most complete, lowest cost Field Day portable HF test bench I can come up with.

The objective is coverage up to 222 MHz with sufficient accuracy and resolution to make experimental design more tractable.

Hantek 2D42 (DSO-DMM-AWG)
3x tinySA (SA and 2x RF synthesizers)
nanoVNA
RFzero (GPSDO)
LCR/transistor tester (need USB unit)
DMMCheck Plus (DMM cal)
Bodnar's pulser w/ 1 MHz repetition rate (TDR)
diode noise source
2x step attenuators
2x RF bridges
2x wide range matching networks
dedicated netbook to control above
cables, adapters, cal kits, etc
battery powered lab PSU

The Hantek is a compromise chosen because it provided 3 functions, was small, cheap and with a claim of 40 MHz BW appears good enough to me. There are possibly better options at the same price point, but they are much larger which is not meet the Field Day portability constraint..

With some care in shopping, the above should be available for under $1000. Despite my grad student slave wages 30 years ago, I'd have bought all that for $1000 in a heartbeat. And $1000 then would be much more today. All I can say is "Wow!"

Don't just sit there, say something! I did *not* start this to hear myself. The wall already serves that function ;-)

Have Fun!
Reg


Peter Ayearst
 

Hi Reg,

That's quite a list. For Field day I figured a dmm and an antenna analyzer was about all I would need. If I needed more test gear to get my setup going for FD I'd turn to socializing. :)

Having said that,? as my homebrew career developed,? there were a couple of test gear that I bought that was like turning the lights on.

The scope was the 1st? major piece of gear that opened the world of rf and immediately became indispensable. A good signal generator was a welcome addition but things really opened up when I purchased a Spectrum Analyzer.?

Being able to measure things made the hb experience even more enjoyable.? Couldn't do without the scope or SA? now.

Next challenge was to develop good measurement techniques and be able to interpret properly.?

Lots of fun.

73, Peter?
ve3poa?


 

I'm looking at this as an EM support function. First responders depend on radios. And we have all seen many trivial repairs that required significant diagnostic tools but took no time to execute. Certainly, for typical Field Day ops a DMM and antenna analyzer are pretty much it. Though TDR would be useful.

After dragging my feet for many years, I finally bought a very fine suite of HP and Tek kit. Then the nanoVNA and tinySA appeared. So the "Field Day Bench" is just rationalization of new toys.

I'm not currently licensed. I have been twice as a novice, but let the 2nd one lapse because I couldn't afford a radio or the T&M kit to build one.

My primary interest is the technology. I find it truly magical. Doing basic undergrad level RF design was previously impossible on ones own without T&M access. Owning the kit was unthinkable. Now it's a reasonable investment in acquiring skills.

Have Fun!
Reg


On Thursday, July 22, 2021, 05:02:13 PM CDT, Peter Ayearst <ve3poa@...> wrote:


Hi Reg,

That's quite a list. For Field day I figured a dmm and an antenna analyzer was about all I would need. If I needed more test gear to get my setup going for FD I'd turn to socializing. :)

Having said that,? as my homebrew career developed,? there were a couple of test gear that I bought that was like turning the lights on.

The scope was the 1st? major piece of gear that opened the world of rf and immediately became indispensable. A good signal generator was a welcome addition but things really opened up when I purchased a Spectrum Analyzer.?

Being able to measure things made the hb experience even more enjoyable.? Couldn't do without the scope or SA? now.

Next challenge was to develop good measurement techniques and be able to interpret properly.?

Lots of fun.

73, Peter?
ve3poa?