Search found 662 matches

by glovisol
Fri Jul 13, 2018 1:56 pm
Forum: General
Topic: Multiple VRX receiver /tuner operation
Replies: 10
Views: 5835

Re: Multiple VRX receiver /tuner operation

Thanks for this reply....But what happens for more VRX'ses? Would one need a desktop with several audio cards?
by glovisol
Fri Jul 13, 2018 11:48 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18315

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

Please be aware that in the balanced n=6 filter schematic in the previous post all capacitance values were wrong. I have now replaced the wrong schematic with the correct version. Sincere apologies,

glovisol
by glovisol
Thu Jul 12, 2018 4:39 pm
Forum: General
Topic: Noise level reading
Replies: 4
Views: 2003

Re: Noise level reading

PSE read thread on low noise operation.
Glovisol
by glovisol
Thu Jul 12, 2018 9:45 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18315

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

...But this Butterworth n=6 in a balanced configuration seems to work much better! Industrial noise has gone, 3.5 to 14 MHz. Noise floor is now close to - 135 dBm on all these bands! Await confirmation from other Forum dwellers. glovisol IMPORTANT ERRATA CORRIGE as of 13/07/18: The original balanced...
by glovisol
Thu Jul 12, 2018 7:52 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18315

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

ANTENNA INDUSTRIAL NOISE SUPPRESSION AT 3.5 & 7 MHz WITH HIGHPASS FILTER

More illustrations below.
by glovisol
Thu Jul 12, 2018 7:50 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18315

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

ANTENNA INDUSTRIAL NOISE SUPPRESSION AT 3.5 & 7 MHz WITH HIGHPASS FILTER Lower frequency HF bands are plagued in daytime by impulse type industrial noise which mainly propagates through ground(s). The problem is compounded with the Beverage antenna which needs two grounds: one at the receiving end a...
by glovisol
Wed Jul 11, 2018 9:47 pm
Forum: General
Topic: Multiple VRX receiver /tuner operation
Replies: 10
Views: 5835

Multiple VRX receiver /tuner operation

I apologize for asking a probably obvious question through lack of experience ....Can somebody explain to me how I go about receiving two or more signals coming from as many VRX'ses / Tuners with a PC with just one audio output? Perhaps this info is available somewhere but I have been unable to find...
by glovisol
Wed Jul 11, 2018 9:41 pm
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18315

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

A propos of system overload.....as soon as the propagation conditions reach a standard level, the 135 m Beverage antenna easily brings the RSduo receiver to the brink of overload on the 40 m band. In the enclosed PC screen the overload condition is provoked by the very strong broadcasting stations o...
by glovisol
Tue Jul 10, 2018 4:11 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 25135

Re: Testing RSPduo receiver sensitivity with noise generator

For completeness here is Figure 6 showing antenna return loss 2 to 14 MHz, thick line. Thin line is return loss with the Material 43 toroid transformer in between. The antenna exhibits series capacitive reactance across most of the frequency range and it is easily tuned with a series coil: this woul...
by glovisol
Tue Jul 10, 2018 1:17 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 25135

Re: Testing RSPduo receiver sensitivity with noise generator

COMPARISON BETWEEN CALCULATED AND MEASURED DATA In order to be able to compare modelled and measured data, I had to reduce the resolution of the Vector Analyser to just 12 points, so frequencies 2 to 14 MHz could be paired in both sets of data. With this resolution all measured parameter oscillation...