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  1. Thread: NanoVNA

    by brandon lind
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    2
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    245

    I ordered the nanoVNA-F for $126. One issue is...

    I ordered the nanoVNA-F for $126. One issue is that it said it ships from the usa. The tracking said its shipping with DHL but the tracking number is not recognized by the DHL website. The tracking...
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    190

    Base Radios I think K7KBN's suggestion will prove the radio...

    I think K7KBN's suggestion will prove the radio is just fine. A quick look online shows that is a 200w radio with split finals having separate power supplies and that the radio requires 41A of...
  3. Good to know! I used a fishing line, bobber and...

    Good to know! I used a fishing line, bobber and sinker to to check our well by feeling when the bobber took on the weight of the sinker.

    At least this emissivity thing can be readily corrected...
  4. Thank you! I missed emissivity day in school!...

    Thank you!

    I missed emissivity day in school! New plan... I am going to buy various rolls of black tape and see which one is closest to E=0.95 (what this IR is calibrated to) so I can just toss a...
  5. Non-radio electromagnetic radiation question and some deep thinking.

    Prepare yourselves for what might be a totally dumb question! I am posting this non-radio question because it is electromagnetically involved, and although it has nothing to do with radio...
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    430

    Thank you! I will read that right now....

    Thank you!

    I will read that right now. Waiting for my better half at the clinic so thats perfect timing!

    Edit: wow! Thats super cool. It brought a few things to my attention i never once...
  7. Replies
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    430

    Just ordered the nanoVNA-F, hope the reviews were...

    Just ordered the nanoVNA-F, hope the reviews were not paid :) although I suspect a 1GHz device should be fairly accurate at HF and VHF.
    I will share the results as soon as I learn the device and get...
  8. Replies
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    430

    Ive read so many times on forums etc that its the...

    Ive read so many times on forums etc that its the inductance that chokes the signal. More inductance=more inductive reactance, right? And that would mean a better choke (especially as frequency goes...
  9. Thread: NanoVNA

    by brandon lind
    Replies
    2
    Views
    245

    NanoVNA

    Has anyone used the nanoVNA's being sold on amazon? I know there is a large variation of essentially the same device. Some have cases, some have RF shielding, some have more accessories... What Im...
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    236

    I think the bigger challenge will be finding one...

    I think the bigger challenge will be finding one with that crazy of bandwidth. Its one thing to use it for RX, but if you intend to transmit on that wide a range of frequencies in both bands...
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    220

    That radio (upon a few searches) seems to have a...

    That radio (upon a few searches) seems to have a history of display problems. It looks like the common culprit among these display problems are bad electrolytic capacitors and burnt (or sometimes...
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    262

    Mobile Radios If narrowband works, the wideband problem is in...

    If narrowband works, the wideband problem is in either the wideband crystal filter itself, the switching diodes (D302 and D303) that switch the RF between the two filters, or something on a digital...
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    262

    Mobile Radios I would guess that someone keyed up with lots of...

    I would guess that someone keyed up with lots of power way too close to your radio and it gave your crystal filter a major headache. Try replacing the wideband crystal filter. It is labeled CF301...
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    250

    I would check the band switch contacts. It might...

    I would check the band switch contacts. It might also be worth inspecting the filter unit.
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    356

    I know nothing about the ts440, but if its...

    I know nothing about the ts440, but if its anything like my ts130s, well....

    My ts-130s was modified by the original owner to go on 11m. The mod involved toggling the levels on the PLL divider....
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    430

    If inductance alone is responsible for the...

    If inductance alone is responsible for the choking effect, i would expect more turns to be better. This seems to not be the case. Also, if these "ugly baluns" did follow that theory, their...
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    430

    Ugly Balun Theory

    Does anyone know how "ugly baluns" function? The most common answer among the google results suggests that the turns give the shield inductance and it is this added inductive reactance that stops the...
  18. Base Radios How close is the receiver antenna to the...

    How close is the receiver antenna to the transmitter antenna? Sounds like you're trying to hear yourself 100w strong on a receiver that is right next to the transmitter. That would be very very mean...
  19. From a voltage and dielectric standpoint, that...

    From a voltage and dielectric standpoint, that coax is rated for 900Vrms. Assuming the worst case scenario of a complete mismatch providing an infinite SWR, the maximum the RF voltage applied to the...
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    1,512

    Sorry for the very minor left turn but I feel...

    Sorry for the very minor left turn but I feel excitedly obligated to add that... being lasers are above 275GHz and a tech license comes with essentially free range above 275GHz, it would seem to me...
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    1,512

    Ham radio can be fairly inexpensive, or it can be...

    Ham radio can be fairly inexpensive, or it can be the most expensive thing you do. For ham radio be for emergency communications only, you would likely be leaning towards a smaller investment....
  22. Not sure on the ear piece but I must ask.... Will...

    Not sure on the ear piece but I must ask.... Will the HF antenna need to be equally inconspicuous?
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    1,030

    That radio comes locked to the ham bands as FCC...

    That radio comes locked to the ham bands as FCC type acceptance does not allow that radio to be sold for or used with GMRS frequencies. You would need to look into a mars/cap modification which...
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    650

    SMA Female to UHF (PL-259) Male ...

    SMA Female to UHF (PL-259) Male

    https://www.amazon.com/DHT-Electronics-coaxial-adapter-female/dp/B00CVQRJG4/ref=sr_1_7?keywords=sma+female+uhf+male&qid=1566483539&s=gateway&sr=8-7
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    As soon as you add a second antenna (assuming it...

    As soon as you add a second antenna (assuming it looks nothing like a CB antenna), people automatically assume ham.

    There is the possibility of using the same antenna, but there are serious...
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