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I srr the same problem.? I will try recalling the cal.? Yhanks for the tip. Mike WY6K "... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and

Hi John, I guess I *could* make a "zero" offset function; at least for S21. But I don't think it would be particularly accurate, considering what you're trying to do? The premise of the app - which is

Hi Maurizio that's probably what is happening here although the new sweep freq was within the range that the cal covered. Ideally (hint to Rune!) the software would contain a "Zero the sweep" button

Hi all, please find attached a dynamic range test of the NanoVNA with several DC-18GHz precision SMA attenuator. Prior to the test I performed a fresh calibration. I think the result leaves some room

On Thu, Sep 26, 2019 at 08:37 AM, John AE5X wrote: Hi John , the VNA Agilent ( like hp8753D hp8720 hp8510C ) that I used at work , when you change parameter of frequency sweep used during the

It is tricky to *legally* ship batteries - in particular lithium ion batteries, especially as an individual or small company. When my company ships VNA calibration kits, we always put “Contains no

@ qrp Thank for the info. Seller did mention right information (without battery) & i opted for it because of restrictions from customs dept. for clearance of items with battery.

it's better to perform 32768 points IFT for TDR. But I suspect it will not fit into the chip memory :)

drkirkby@...> wrote: What I meant to say is that changing the system impedance doesn’t change the efficiency of the antenna. You change the efficiency by changing its losses. Dave

Thanks guys - I got it corrected and have posted the new result to the link listed above. The fix was that I have to recall the saved cal data each time I change the sweep. I calibrated the nanoVNA on

SWR and resonance are not the same thing. An antenna can be resonate but have a VSWR of 100:1. Another antenna may have a 1.5:1 VSWR, but not be resonate. Efficiency = good antenna is a matter of

Thanks for info. Is it safe to solder it with heat gun? It seems that the plastic parts can be damaged.

I got NanoVNA with 3.7V 450mAh battery It has code 602040 and no other identification. But NanoVNA works 2 hours from it. My shipment is delivered with air mail. So, it seems like your seller provided

Mouser has a 600 mAh Renata ICP622540PMT for $17.79 (USA only) and I might buy that, since I know it will be good, if I can't find a cheap MP3 player with a suitable battery in it. Bear W5VZB

this is exactly the document that I had read, thank you

HI qrp.ddc, this is the replacement OEM joystick recommended on the wiki: https://lcsc.com/product-detail/Multi-Directional-Switches_Korean-Hroparts-Elec-K1-1502SA-01_C145915.html this one is also

I added a Goggle translated user guide (NanoVNA_manual _ch045) to the "Files" section of this group. Full credit and appreciation go to Hiroh Satoh (user "ch045"). The untranslated version can be

Bruce, I added the full Goggle translated user guide (NanoVNA_manual _ch045) to the "Files" section of this group. Again, full credit and appreciation go to Hiroh Satoh's (user "ch045").

Ok, thanks I'll focus on transmitting then as it generally goes that an antenna thats good for transmitting on a certain band will also receive on that band ;)

John, The first step before performing the OSLT (Open-Short-Loa-Thru) calibration is to select "RESET" under the CAL menu. Neglecting to do this can result in the -10dB offset you are seeing.