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Hi Zack One way to tune the preamp to best system Noise Figure is to feed a weak CW signal into the Preamp and your radio.? Put the radio into FM mode.? ?Adjust the preamp for best FM quieting.?

I use at least a 40 dB attenuator on the input with preamps. I mainly want to scan the preamp to see where the passband is. If the preamp can be adjusted, I adjust it so the passband is centered on

On Auto, if the LNA maintained linearity, it would deliver 3 watts back into the NanoVNA. NOT RECOMMENDED! Safe guess the LNA will limit, but could still be enough power to damage the Nano. You really

A related question is what power is acceptable on port 2 (of an H4)? I have an LNA I wanted to measure the gain of but not having a large selection of attenuators I was afraid to do that. It has 24 dB

2023? - No, in DiSlord's repo you'll get the latest and greatest version from 25.Feb.2024 - just build it and load it into your NanoVNA-H. If you do not want to build the binaries on your own you can

Then why is the firmwares from 2023 in that github repo? I thought I saw a group message from last week or so with newer ones. But I can't find that message anaymore.

Good day hive mind, suggestions please. NanoVNA-H4, latest software installed, not connected to pc, SOLT cal done antenna shorted out prior to connecting to VNA However when I connect the antenna all

That's him, although if you are looking for firmware, that's not the correct repo - that's the app. Firmware for the most common units is in https://github.com/DiSlord/NanoVNA-D - Tim -- Tim Dawson

yes Am 28.02.2024 um 21:49 schrieb Nick:

DiSlord, Are you the same user as:https://github.com/DiSlord/NanoVNA-App/tree/main ?

Hi DisLord, I want to update a nanovna-h device and a litevna64. I cannot find the firmware because the messages are not created with a correct subject. The messages are completely spammed with lots

There a nice picture of a Zeppelin with such an antenna deployed at https://www.dxzone.com/dx34977/zeppelin-aerials.html Half-wave radiator with quarter-wave matching transmission line. 73, Maynard

The zeppelin patent with a diagram is attached. ?The priority was to avoid sparks as the hydrogen in the envelope might explode. There was no transmission line as the antenna was linked coupled to

The dBm values I posted are for the fundamental frequency. The screen caps in my original post display the dB of the harmonics relative to the fundamental. Being a square wave, the harmonics are quite

Te Zeppelin story is real. PBS had the lowdown on the errors made which caused the explosion. My folks witnessed the "story" realtime when they were living. BTW: the feed impedance of a 1/4-wavelength

That is correct. The part of the open-wire quarterwave feedline closest to the Zeppelin is a voltage node. 73 Peter Patent DE225204 from 1909:: https://www.cdvandt.org/DE225204.pdf

As far as I know the zepp is a halfwave wire fed over a quarter wave transformer and NOT a quarterwave against the zeppelin frame dg9bfc sigi Am 28.02.2024 16:28 schrieb N2MS <mstangelo@...>:

Hi Andy, Ward, AE6TY, did this and offered to help with the software he used. You can google AE6TY and SimSmith to find his web pages. John, WoGN

Are the figures for total power including harmonics or just the fundamental? Brian

Barry, This discussion is nothing new. Hams were and are always looking for an antenna that will do it all and require minimal installation. The EFHW is just the 21st century version of Gotham