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Ryan, Looking at the schematic, what if you separate the 9v input for the finals drain and feed 14v to it. That way you can use just one 8v regulator to the rest of the system. Juan WP3DN

Wow!? I have certainly learned a LOT about the TinySA (I think ron meant this when he wrote "nanoVNA") in this discussion!? ?Joerg has apparently proven conclusively on his unit that there is an

Good question. ?I do not have a test & measurement lab; nor am I a qualified test & measurement technician. I know what those are, having worked up at HP Labs in the distant past, with access to

We should be looking at LiFePo4 packs: https://www.amazon.com/Talentcell-LiFePO4-Battery-Rechargeable-Phosphate/dp/B0DSW2S7YH/ Mike N2MS

They should work great, I'm using these, https://www.amazon.com/dp/B0CQ2H8KKS?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1 and they run the zBitx for a longer time compared to the 2 cell pack that failed

Hi I have some LiPo power packs, 2S, with various power (capacity) ratings. Some are rated for a discharge rate over 20-30 times the rated nominal capacity. I have no economic reason or interest in

As a final proof, that the TinySA results in this specific scenario (we are NOT measuring IMD of the PA, but spurs) are trustworthy, I connected my *Hermes-Lite-2* to exactly the same attenuator chain

Evan, the *-25dBm input limit* for best measuring results of the TinySA is meant for the *input level at the mixer.* The TinySA has an integrated programmable 0-31.5dB attenuator (PE4302 or

You made my day! Thank you, all ok now! Wolfgang, DH2WS

That took care of it... Thanks, AC4OW, Sam Hanie samhanie@... [email protected]> wrote:

Sam and Wolf, It looks like the front panel is exerting pressure on the display and pressing the screen causing it to "self-calibrate".? As Vince suggests, loosen the front panel bolts ever so

I have a professional grade Advantest R3361C. I was also on the beta testing team for TinySA. I'm sure since beta testing, it would likely have got better if anything, not worse. During my testing of

I would like to run my zbitx at 12vdc and up to 14vdc. ?I already swapped the linear regulator and the finals and re biased. ?It works great up to about 10vdc over that the receiver starts to

Don, he may not HAVE one. He may consider spending $1400+ to get a Siglent or Rigol a high price to pay to check a $200 radio, right? We have a NICE discussion of why cheaper analyzers may fail

Why don't you use a REAL spectrum analyzer, like an Agilent or Rohde Schwarz? Don in Texas, N5CID ============================================= */On 4/16/2025 10:35 PM, Ron, N6YWU via groups.io

Reducing the zBitx Drive via its menu did seem to reduce the spurs relative to the carrier, but not by quite enough. ?I reduced the drive until the TinySA was showing the carrier at -40 dB (that's 12

I added enough attenuation to reduce the carrier from my zBitx to -28 dBm, and still saw a spur at -60 dBm, which is only 32 dB below the carrier. ?That's a long way from -43 dBc. But I have only one

OK, can people try this out: 1. Set the CW delay to 600 2.Now, try Iambic A and straight key, let's hear if there is a problem with these. We will move to Iambic B if we can narrow the problem down

There is intermodulation, without doubt. However, my readings show that it is well within the FCC limits. I took a closer look at the TinySA, it is an incredibly cool design

Hello Richard, If you can build from scratch, I would recommend the LED/LDR combination from VK3YE: https://www.youtube.com/watch?v=C4g7QRmFnr8&t=66s I have built two of these for other hams.? Both