Hello Chris,
Am 12.05.2019 12:45, schrieb Chris Wilson:
Can
I initially lay insulated stranded but each single core UK 15 Amp
mains wires on the ground's surface to the rods?
Yes, a good choice.
The rods, which DC ground resistance will they provide? You can do a
first measurement at DC, > 50 V. Or at 50 Hz AC.
Is 50 yards earth rod
spacing adequate
Use as much distance as possible. 100 yards will result in a 6 dB
stronger signal, theoretically.
and should I try to get them in a ditch that's
usually constantly wet?
Yes, preferred. You can start measuring the loop's loss resistance and
then optimise it. I'm curious for the first results. Maybe you will be
THE transmit station from the UK, because currently there is no one
(amateur...).
73, Stefan
I picked up my amp a few weeks back, it looks
quite a beast! Thanks Paul Nicholson :) Toroids should land this week.
Saturday, May 11, 2019, 7:29:56 PM, you wrote:
Hi Chris,
Did you already lay out wires? And did you already get the amplifier?
73, Stefan
Am 09.05.2019 16:47, schrieb Chris Wilson:
Hello Stefan,
Thanks, ordered 3, so get free shipping, it was cheaper than ordering
2 and paying shipping :)
Thursday, May 9, 2019, 2:34:58 PM, you wrote:
Hi Chris,
I would not recommend the one you selected because it has an unnecessary
large inner diameter and a lower height, thus a lower AL value.
I think this is the same one that i recommended from Bürklin:
https://www.mouser.co.uk/ProductDetail/EPCOS-TDK/B64290A0699X830?qs=sGAEpiMZZMs2JV%252BnT%2FvX8Df1W1GtRs010YpcsJh6dvk%3D
It is also cheaper.
There are other materials available, such as T65, T38, T37, offering a
higher AL value. Maybe these are even more suitable at that sort of
frequency but i didn't spend too much time to select the best core for
each frequency. I use the N30 material from 1 kHz to MF at high power (
>> 1 kW for one core) without problems. So this is what i recommend. It
will work.
73, Stefan
PS: If you want to bridge one of Paul's 2x 7.2 kW amps, you may need two
of them ;-)
PPS: You may want to build two orthogonal ground loops then, one per
channel. With SpecLab you can then drive each channel separately and so
you can build a software rotatable loop by aligning the phase between
the channels, while staying into the shack when its cold and/or rainy :-)
Am 09.05.2019 14:42, schrieb Chris Wilson:
Hello Stefan,
I am now on to building a matching transformer but it seems Buerklin
have a minimum order of 60 units! I have found this bigger core at
Mouser, could I use that instead please?
https://www.mouser.co.uk/ProductDetail/EPCOS-TDK/B64290L0730X830?qs=4l9S5vBWkUJtsO6ZFRCS4g%3D%3D
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