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Date: Sat, 11 Jan 2014 23:32:25 +0100
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References: <stb7jj8i36ykvnjmhn2w1jb9.1387917789184@email.android.com> <35FE4D7949D24153B93AD287570B1AA6@Clemens0811> <52CDB98E.2090806@iup.uni-heidelberg.de> <07DCC8F8EED14FA7A932FF8F90ED27A6@Clemens0811> <52CDD7DE.8080807@iup.uni-heidelberg.de> <34613E4DA8F14D389A2BCF8A04DDF0DA@Clemens0811> <52D1B87C.80005@freenet.de> <E2DE4EC9105C43E0847B31050309F109@Clemens0811>
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Content preview: Hi Clemens, Am 11.01.2014 22:58, schrieb Clemens Paul: > The
dipole is a horizontal 90°V, 8-15m high and according to EZNEC it has a spheroidal
> pattern with no nulls. Ok... that makes a difference. > The vertical part
of the feeder is only about 6m long. So the rainworms will be cosy and warm
around the lower parts of the antenna, hi.. > Tomorrow I'll check the impedance
of the antenna aagainst ground with both feeder wires > connected > and see
if I can match it to 50 Ohm,dependent on the available parts. That would
be a good indicator for the ground conductivity. At the local antenna farm,
the total resistance (after compensating the reactive part with a series
coil) went up from 26 to approx 35 ohms within a few months. During transmit,
I simply use the PE (plus possibly the underground cables) as counterpoise.
During RX, the PE is disconnected from the antenna's own 'ground' which consists
of a few buried wires, to prevent QRM from the mains creeping in. Another
remote RX antenna is already planned, most likely it will be a small active
loop or a system of crossed loops. [...]
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Subject: Re: LF: RE: Clemens on MF!!
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Hi Clemens,
Am 11.01.2014 22:58, schrieb Clemens Paul:
> The dipole is a horizontal 90°V, 8-15m high and according to EZNEC it has a spheroidal
> pattern with no nulls.
Ok... that makes a difference.
> The vertical part of the feeder is only about 6m long.
So the rainworms will be cosy and warm around the lower parts of the
antenna, hi..
> Tomorrow I'll check the impedance of the antenna aagainst ground with both feeder wires
> connected
> and see if I can match it to 50 Ohm,dependent on the available parts.
That would be a good indicator for the ground conductivity.
At the local antenna farm, the total resistance (after compensating the
reactive part with a series coil) went up from 26 to approx 35 ohms
within a few months.
During transmit, I simply use the PE (plus possibly the underground
cables) as counterpoise. During RX, the PE is disconnected from the
antenna's own 'ground' which consists of a few buried wires, to prevent
QRM from the mains creeping in. Another remote RX antenna is already
planned, most likely it will be a small active loop or a system of
crossed loops.
Cheers,
Wolf.
( where is everyone .. now hearing only " -... .. .- " ? )