Search found 658 matches

by glovisol
Fri Sep 07, 2018 11:27 am
Forum: General
Topic: Ghosts in the system
Replies: 11
Views: 4005

Re: Ghosts in the system

While you listen to the S7/S9 Colorado stations at 14 MHz, the Californian stations transmitting hi power (1.5 kW) are OVERLOADING your WIDEBAND front end, get multiplied by a factor of 2 and you see them as 14 MHz signals. The proof: listen in the 7 MHz band and check that here no signal is above S...
by glovisol
Thu Sep 06, 2018 3:05 pm
Forum: General
Topic: Ghosts in the system
Replies: 11
Views: 4005

Re: Ghosts in the system

Hi Alex, Most likely your problem is system overload: you can see a clear example here: https://www.sdrplay.com/community/viewtopic.php?f=5&t=3436 In the enclosed PC screen: Near overload @ 7 MHz. The S meter was above 9+40, but the PC screen collecting software reduced it while taking the picture E...
by glovisol
Thu Sep 06, 2018 2:41 pm
Forum: General
Topic: REMOTING RSP VIA USB - PROBLEM SOLVED
Replies: 4
Views: 2526

Re: REMOTING RSP VIA USB - PROBLEM SOLVED

DISTINGUITUR.....DISTINGUITUR, this is the most used word of St. Bonaventura da Bagnorea, summus scholastic philosopher of the Catholic Middle Ages. To what lightning danger are you referring to? A) An induced strike on the long wire antenna will be blocked by the balun transformer, whose primary m...
by glovisol
Thu Sep 06, 2018 6:27 am
Forum: General
Topic: HF weak signal reception in presence of noise
Replies: 10
Views: 4805

Re: HF weak signal reception in presence of noise

Hi Mike 2459, You did not state at what frequency you took the readings. Floor noise variation with RF gain changes with frequency: see Table 1 here https://www.sdrplay.com/community/viewtopic.php?f=5&t=3352 where significant measurement conditions are given and data was measured with IF AGC ON. The...
by glovisol
Wed Sep 05, 2018 3:57 pm
Forum: General
Topic: HF weak signal reception in presence of noise
Replies: 10
Views: 4805

Re: HF weak signal reception in presence of noise

NOISE BLANKER EFFECTIVENESS WITH STRONG IMPULSE NOISE Noise blanker adjustement when in presence of strong antenna noise plus impulsive noise is extremely critical, not to say impossible, without resorting to manual gain and keeping RF and IF AGC OFF. On the contrary, with the AGC's OFF, Noise Blank...
by glovisol
Wed Sep 05, 2018 1:23 pm
Forum: General
Topic: Remote RSP via USB/CAT5
Replies: 27
Views: 9528

Re: Remote RSP via USB/CAT5

Hu guys, I judge this info so important I am also posting it in this thread! Today I received an USB2.0 repeater cable manufactured & sold by LogiLink Germany with a length of 10 m. On Ebay I paid EUR 11.00 for the cable + EUr 7.00 for express courier shipment. Connected the cable between the PC USB...
by glovisol
Wed Sep 05, 2018 1:21 pm
Forum: General
Topic: REMOTING RSP VIA USB - PROBLEM SOLVED
Replies: 4
Views: 2526

REMOTING RSP VIA USB - PROBLEM SOLVED

Today I received an USB2.0 repeater cable manufactured & sold by LogiLink Germany with a length of 10 m. On Ebay I paid EUR 11.00 for the cable + EUr 7.00 for express courier shipment. Connected the cable between the PC USB output and the 5 m USB cable coming from my RSPduo. Switched RSPdu on: the s...
by glovisol
Tue Sep 04, 2018 6:33 am
Forum: General
Topic: HF weak signal reception in presence of noise
Replies: 10
Views: 4805

Re: HF weak signal reception in presence of noise

Another example with AGC + IF AGC in manual and at minimum with perfect copy of S5 signal in S5 noise.
by glovisol
Mon Sep 03, 2018 9:55 am
Forum: General
Topic: SDRuno S-Meter = S5 With No Antenna
Replies: 13
Views: 6317

Re: SDRuno S-Meter = S5 With No Antenna

Hi Murphy, As an old timer like yourself, in the fifties & sixties I used different receivers, amongst them the Racal RA17 and the Collins 75A4, at the time judged the best. - With AM reception one kept AGC ON and audio level was adjusted with the volume control. - With SSB reception one kept AGC OF...
by glovisol
Sun Sep 02, 2018 12:56 pm
Forum: General
Topic: HF weak signal reception in presence of noise
Replies: 10
Views: 4805

Re: HF weak signal reception in presence of noise

To reiterate and summarise after a lot of listening, this "noise advantage" is very marked as long as the antenna noise is high, in the order of -100 to -110 dBm and becomes less and less significant for antenna noise at or below -125 to -130 dBm. With my setup, Beverage antenna on the 80 & 40 m ban...