Lee,

Using the loop indoors, at ground-floor level, at 20MHz, on a
groundwave path, is not inconsistent with what you get. Get it
high-up, outdoors, and it will make a big difference.

The capacitor is made from a length of coax. I wonder how long it is
and how it is located relative to the loop? Wherever it is, being
unbalanced coax it will unbalance the loop.

But what worries me, the very thin coaxial inner conductor is in
series with the main loop conductor. It may have a loss resistance
several times greater than the large diameter main loop. You could be
losing a lot of decibels.
----
Reg, G4FGQ.

But what worries me, the very thin coaxial inner conductor is in
series with the main loop conductor. It may have a loss resistance
several times greater than the large diameter main loop. You could
be losing a lot of decibels.

=====================================
Lee,

If you cut the length of coax into, say, 7 equal lengths and connected
them in parallel you will have a capacitor of the same value but with
a loss resistance only 1/7th of the single length.

More compact too. 6 fit very nicely round 1. Bundle them up in a
plastic bag to keep off the rain.
----
Reg, G4FGQ.

"Reg Edwards" wrote in message
...


Lee,

If you cut the length of coax into, say, 7 equal lengths and connected
them in parallel you will have a capacitor of the same value but with
a loss resistance only 1/7th of the single length.

RG8 / UR213 would be more convenient i should think Reg if i were running a
bit more QRO......

More compact too. 6 fit very nicely round 1. Bundle them up in a
plastic bag to keep off the rain.

I`ll try that Reg..... i have an old QRP atu with air spaced variables
around 350pf with slow motion drive i could use on a more ambitious project
a little later....good for 100watts or so SSB...Yes?

Lee...G6ZSG.......

"Reg Edwards" wrote in message
...
Lee,

Using the loop indoors, at ground-floor level, at 20MHz, on a
groundwave path, is not inconsistent with what you get. Get it
high-up, outdoors, and it will make a big difference.

Next, after testing 2` above ground.......

The capacitor is made from a length of coax. I wonder how long it is
and how it is located relative to the loop? Wherever it is, being
unbalanced coax it will unbalance the loop.

Isn`t a variable butterfly vane capacitor unbalanced also as is the co-axial
trimpot and the compression piston cap?..they are all used on magloops Reg.

But what worries me, the very thin coaxial inner conductor is in
series with the main loop conductor. It may have a loss resistance
several times greater than the large diameter main loop. You could be
losing a lot of decibels.

I`m listening

Lee....G6ZSG.....