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Today I was doing two things at once, and unfortunately transmitted 400W of SSB into my inverted-V while my nanoVNA H4 was still hooked up to my OCFD antenna! Although they are perpendicular, they're not far enough apart to save the front end on the H4 :(

So - how difficult is this to repair? Are the parts expensive, or too small to replace by hand (i.e. should I just buy another)?
Thanks for any helpful hints.
-Charles

I would assume significant and maybe subtle damage and replace it.

Chuck
K4TZO

On Thu, Feb 20, 2025 at 10:29?PM Charles, WB3JOK/0 via groups.io
<charlesmorris800@...> wrote:

Today I was doing two things at once, and unfortunately transmitted 400W
of SSB into my inverted-V while my nanoVNA H4 was still hooked up to my
OCFD antenna! Although they are perpendicular, they're not far enough apart
to save the front end on the H4 :(

So - how difficult is this to repair? Are the parts expensive, or too
small to replace by hand (i.e. should I just buy another)?
Thanks for any helpful hints.
-Charles

--
Chuck Cole ?K4TZO

Normally this destroys some surface mount components. Unless you have
experience replacing surface mount components a new unit is the best
option. Also. There are several YouTube videos about this situation.

On Thu, Feb 20, 2025, 10:29?PM Charles, WB3JOK/0 via groups.io
<charlesmorris800@...> wrote:

Today I was doing two things at once, and unfortunately transmitted 400W
of SSB into my inverted-V while my nanoVNA H4 was still hooked up to my
OCFD antenna! Although they are perpendicular, they're not far enough apart
to save the front end on the H4 :(

So - how difficult is this to repair? Are the parts expensive, or too
small to replace by hand (i.e. should I just buy another)?
Thanks for any helpful hints.
-Charles

I have done a few surface mount repairs, and I have a tiny Oryx 6-watt iron and some tweezers :)
But I can't locate the videos you refer to. I've tried searching on Youtube for every combination of nanoVNA and rf input, burnout, etc.

In the meantime I have ordered the same model H4 (with excellent reviews) from Aliexpress again, $61 with tax and shipping.