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Today I have been measuring an antenna, and I got some strange results. Perhaps someone out there could give me an answer to the strange results? The antenna is a 2x19.3m dipole, about 6m above

Good thing I don't enter them in beauty contests, I use them.

Kent, Here is a case I designed for my Nano. It uses Neo magnets to hold the accessories cover in place. The VNA is basically wedged (comfortably) in the opening. I use a 6" SMA to BNC coax cable from

Roger, That's precisely what I was after, many thanks! - Roland 9V1RT

Andy, I had noticed the duty cycle limitations in the datasheets for the Philips parts, so I figured that if I did use them, then I would limit output power. Perhaps the TACS part is the more sensible

Roland, Since this is an off topic discussion I will keep it brief. Manufacturers of RF equipment in the USA are subject to the rules laid out in the code of federal regulations (CFR) 47 2.805 when

To clarify, I intend to operate at a fixed frequency, no modulation, preferably somewhere in the 900MHz ISM band, driven by an amp operating at less than 5W. Each run of the experiment should only

Roger, I can trace 4 of those 5 to specific sections, but not the "manufacturer developing" case. Do you happen to know whether/where/how that's addressed in the regulations? (I'm not subject to FCC

Roger, My experimental setup should fall under part 18. Realistically, this actually is a scientific piece of equipment - it will be used to perform some science experiments not related to

On 10/7/21 3:01 PM, Roger Need via groups.io wrote: > On Thu, Oct 7, 2021 at 12:01 PM, msat wrote: > >> @Roger >> >> I'm in the US. I may very well be wrong, but I don't think operating in the >> ISM

Yes, that's how it decides which harmonics to use.? If it's <threshold, then fundamental on both if >threshold, but < threshold*3 (i.e. 300-900) then source is 3rd harmonic, mixer is 5th - if the

I worked for a company that sold equipment containing 900 MHz transmitters and my team was responsible for the design, testing and regulatory approval. We sold to may countries in the world and the

I should have said: Even if it wasn't, it would just mean that if the freq variable was greater than the harmonic threshold variable multiplied by 5 (the 5th harmonic) then it would set the frequency

Jim, In the code, the following lines are commented out /* if (freq > config.harmonic_freq_threshold * 5 ) { freq /= 7; ofreq /= 9; }else */ Even if it wasn't, it would just mean that if the freq

The Tx and Rx sides of the Nano use different multiples (so that the receiver doesn't "detect" the fundamental or "wrong" harmonics from the Tx side) The code seems to say 5 and 7 for Tx, Rx

@Jim Lux While I'm pretty sure the nano only uses the fundamental as well as the 3rd and 5th harmonic for measurements, your point is taken. You did give me an idea for a potential solution, and

The ISM band at 900 MHz. is only "unlicensed" for the user/purchaser of the equipment in most countries (UK, EU, US, Canada, Australia etc.) The manufacturer of this equipment MUST have his product

You have to reflash with the correct firmware. To get back to DFU mode you have to short the VDD and Boot0 pins inside the NanoVNA. The procedure is all described in the "Absolute Beginners Guide to

flashed my NanoVNA-H withNanoVNA-H4_20210131.dfu, i think this was wrong. White screen and usb port is no longer recognized. What should i do? Friedrich db6px

On 10/7/21 9:10 AM, msat via groups.io wrote: > @OneOfEleven > > I did mention a few times that I intend to transmit at a fixed frequency in the 900MHz ISM band. I haven't decided which frequency