[Lowfer] TH and HS

[Bill Ashlock]

Peta,

>Please clarify:

> > For matching I used a J type toroid (permeability ~5000)
> > with a single pass on the loop side and 7 turns on the 75
> > ohm receiver side. Same as a TX loops in reverse since
> > the Rac of the series tuned loop comes to ~1 ohm.

>I understand the toride windings, step-up of lower-Z loop to coax,
>right? So where is the "reverse"?

You're right. I musta been looped when I said that!

Having some fun with this loop, comparing the signal to the signal from the 
tree antenna. I have an A/B switch to allow quick changes back and forth. 
Luckily the average signal strength is about the same on both antennas. So 
far, without a remote tuning cap, I'm forced to use only one frequency at a 
time and, at the moment, it's NDB DIW, which is fairly weak tonight.

Earlier this evening the loop was swamped by a neighborhood light dimmer but 
this was turned off at 11:10pm. As I mentioned quite a while back I have 
buried wires and a copper pipe leading to the garden near the loop and the 
noise currents in these conductors play havoc with the loop - not so for the 
tree antenna. After 11:10pm the dimmer noise was totally gone and the only 
noise was distance lightening static. At times, I could switch antennas 
without hearing the slightest difference on DIW, but at other times the tree 
antenna was clearly the better receptor in terms of strength and S/N. Will 
continue these tests over the next week.

Bill


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