[R-390] R-392 Performance on Loop antenna

[Peter Worrall]

I have been playing with a 1 metre square loop antenna soldered up from 15mm
water pipe lengths. I use a 1000pF cap to tune (it runs 2700 to 14500kc
barefoot) and I add a parallel pair of 1000pF 10kV caps to take it down into
top band.

As the R-392 has been out to play with on the bench for a few weeks, and I
am running it from a 30 vdc accumulator, I decided to try the loop on the
r-392.

The performance is astonishing!

The loop delivers enough rf to overload the '392 on 4000 to 6000kc after
darkness has fallen. Performance is excellent over the entire range with
topband noise (a real problem here) reduced to very low levels. The
directivity and the e-wave noise immunity contribute to its performance and
off set the lower signal levels it delivers to the RX load.

To anyone wishing to use HF receivers in a noisy or no-antenna environment I
would recommend using loops they are easy to build and most effective buck
(�) for dB. BTW there is no hi-Z amplifier between the loop and the
RX....just a screened single turn of coax and an inductive coupling link.

I will take the 392 out to a rural noise free location on batteries with the
loop to see what the performance under those conditions is like in the next
week or two. The results will  be posted later.

73

Pete G4GJL