Search found 662 matches

by glovisol
Sat Jun 30, 2018 7:58 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, On second thought wonder if you could look again at your last antenna model and provide R / JX data from 2 to 14 MHz, but evenly spaced, i.e. every MHz. It should then be possible to implement an autotuner which could zero the capacitive term at every frequency.... What worries me is the ...
by glovisol
Sat Jun 30, 2018 7:46 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, I am simply amazed by (and a little envious of) your capabilities about antenna modeling. I have also seen you are also equipped with the AA - 1400, top of the range antenna analysis meter, so you are able to close the circle, from design, to modeling, to actual antenna measurement and I ...
by glovisol
Sat Jun 30, 2018 5:12 am
Forum: General
Topic: Strange "noise" on 14 MHz
Replies: 1
Views: 1330

Strange "noise" on 14 MHz

A very strange wideband noise started on the 20 m. band in the afternoon (16 GMT). Most signals are blotted out and the phenomenon is detectable by the fact that the top of the display becomes whitish. It is still going on now, 5 GMT of June 30. All other frequency bands are in normal condition, as ...
by glovisol
Fri Jun 29, 2018 4:38 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, it is 18:00 hours and I am back (tired) from the Riviera. Tomorrow I shall study your material in detail. Here I wish to give you physical details of the Beverage and of my setup, because I fear it is far simpler than you imagined. The antenna is held to the side of the house with a tripl...
by glovisol
Fri Jun 29, 2018 4:21 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, It is six in the morning here and I have just seen your fantastic response. Unfortunately today I cannot even read it properly, as I have to go to sea, on the Riviera, to bring help to a friend of mine who has burned out the diesel on his sailing boat and I have to go there to see the wor...
by glovisol
Thu Jun 28, 2018 6:25 pm
Forum: General
Topic: Sdrplay rsp1a help
Replies: 4
Views: 2267

Re: Sdrplay rsp1a help

An intermittent antenna connection, perhaps?
by glovisol
Thu Jun 28, 2018 12:57 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

More PC screens enclosed. Use of a correctly matched balun lets you use all the sensitivity advantage of the Hi Z input from broacast band up to the 40 m band. By using normal windings on the cores (not wireline) it is possible to keep the Hi Z input balanced as well (terminal "N" floating) and this...
by glovisol
Thu Jun 28, 2018 12:52 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

More PC screens enclosed
by glovisol
Thu Jun 28, 2018 12:49 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 28982

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, Thanks a lot about your offer of assistance, which I surely need. I can see from your photos that you must have accumulated a big experience! The necessary complement to a Beverage antenna is a properly working balun. To feed an RSP type receiver we need a nominal 600 Ohm antenna input to...