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by glovisol
Sat May 25, 2019 3:14 pm
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

LOOKING AT THE ORIGINAL ANTENNA PLANT SCHEMATIC The antenna work described in this thread was caused by the desire of improving my antenna system and is based on the following ideas: 1) I could improve the antenna by increasing the length to the limit of space available, e.g. from 135 to 160 m. 2) ...
by glovisol
Sat May 25, 2019 2:43 pm
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

NOISE PERFORMANCE COMPARISONS - 4 Shown below is noise & signal level differentials @ 21 MHz with very weak propagation at midday. In compare 1 we have -110.9 dBm of....noise at 21.300 MHz, with compare 2 we have -105 dBm with solid copy at the same frequency. This really makes the difference.
by glovisol
Sat May 25, 2019 6:52 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

NOISE PERFORMANCE COMPARISONS - 3

Shown below is noise & signal level differentials @ 3.8 MHz in early morning with little noise.
by glovisol
Fri May 24, 2019 7:35 pm
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

NOISE PERFORMANCE COMPARISONS - 2 More detailed comparison @ 7 MHz, after sunset, 19:10 GMT. The screens (taken seconds from one another) demonstrate that, with the modified termination setup, received signal level increases while noise level goes down by a very significant amount. This condition o...
by glovisol
Fri May 24, 2019 4:40 pm
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

NOISE PERFORMANCE COMPARISONS - 1

Another example of the noise advantage of modified terminations, on 14 MHz this time, near midday today, with highest man made noise.
by glovisol
Fri May 24, 2019 5:17 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

BEVERAGE ANTENNA TERMINATION - 3 - THE FAR END TERMINATING RESISTOR - MEASUREMENT DATA SUMMARY Below is the data summary across 0 - 29 MHz in 1 MHz steps for |Z| and VSWR with a 390 Ohm load resistor, 3.6 m deep ground stake at the far end and 1.8 m depth ground stake at receiver's end. Straight do...
by glovisol
Thu May 23, 2019 9:17 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

BEVERAGE ANTENNA TERMINATION - 2

- THE FAR END TERMINATING RESISTOR


Test results compared at higher frequencies: VSWR.
by glovisol
Thu May 23, 2019 9:15 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

BEVERAGE ANTENNA TERMINATION - 2

- THE FAR END TERMINATING RESISTOR


Test results compared at higher frequencies: Real part.
by glovisol
Thu May 23, 2019 9:14 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

BEVERAGE ANTENNA TERMINATION - 2

- THE FAR END TERMINATING RESISTOR


Here below VSWR results compared.
by glovisol
Thu May 23, 2019 9:11 am
Forum: SDR Antennas
Topic: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION
Replies: 18
Views: 1187

Re: NOISE ADVANTAGE OF LONG WIRE ANTENNA FAR END TERMINATION

BEVERAGE ANTENNA TERMINATION - 2 - THE FAR END TERMINATING RESISTOR Theory and software modelling place the impedance of the Beverage antenna at a value between 500 and 600 Ohm, depending on wire altitude over ground and soil characteristics. The previously uploaded test results, done with 560 Ohm ...

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