[Lowfer] Xdw

[Laurence KL7UK]

Hi Charlie - just back from Atlanta (lots of ice) and DC ( lots of traffic)...
 
Heres the tuning inductors (a lot) and the tx is the ZL1BPU DDS taken this evening - as you can see its a lash up inside the office but a lot of fun - rather surprising that the PC and DDS which are about 2ft from the Kv/m+ feed out of the window dont appear affected. The installation has to be and is somewhat covert in operation in so far as if you are about more than 4 ft from any of the wires so cant see anything - same for the thin Green radials down the side of the fences, walls, fences.. The current meter hanging off the top inductor is a W1TAG variant. The Class AB1ish final (TDA7056B) is rather inefficient and I can squeeze another dB or so with a class D but Im playing with some more Linear modes at the moment so happy with my lot.
 
The antennae is about a 40ft wire up to a Pecan tree - no top loading at all and highly inefficient but virtualy invisible as used in hotel operations  - 
 
Been playing up in Alaska with VLF http://kl7uk.com/VLFAlaska.html  but being plagued with AC drop outs and cant for a number of reasons run an APC up there -  Cheers
 		 	   		  
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