Sorry if this has gone out twice Bill -
Using a scope to get peak voltage and them do the (rms)2/Z sums and such
like, Ive come to the impression that my Z out of my Tx isnt exactly 50
ohms!
However to cut a long story short - I reckon my total resistance is about
30 ohms at the moment, may be a few ohms less, maybe a couple more. What
doesnt lie Im hoping, is the thermocouple readings at one end and the
HP6434 V/I meter at the other
Changes include adding about amother 500pf to the top loading - pull and
rearranging the load to be away from trees, adding more HV insulators,
cutting down the odd tree overgrow, replacing the old variometer with a 8
gauge version, and finally using a autotransformer before the main coil, I
think 3c90 core with 14T primary and 13T on towards the variometer, all with
1.5mm2 wires.
Im still having issues with the W@G source on 275KHz - I need to buffer the
+10 dBm 600ohm output a bit more as the sig gen is only just clocking the
divider chip in the TX - if it doesnt clock properly all sorts of grief
happens....
Cheers
Laurence
From: "Ashlock,William" <[email protected]>
Reply-To: [email protected]
To: "'[email protected]'" <[email protected]>
Subject: RE: LF: beacon on
Date: Sun, 10 Aug 2003 22:43:52 -0400
Laurence,
Are you saying that you have R = P/Isq = 70/(2)sq = 18 ohms for your total
system resistance? If so, that would be very good. Thought you measured 50
ohms last week.
Bill A
> WD2XDW Anchorage now on from 2230Z Saturday till 1500Z Monday morning.
New
> variometer gives extra 0.1 amp! New/rearranged top loads and chainsaw
gives
> another....around 2 amps aerial current for 70Wsih into the coil
>
> 137.7739 +-
>
> Laurence KL1X
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