Search found 385 matches

by glovisol
Wed Mar 20, 2019 5:16 pm
Forum: General
Topic: A CLOSE LOOK TO LOW COST NOISE GENERATORS
Replies: 24
Views: 1936

Re: A CLOSE LOOK TO LOW COST NOISE GENERATORS

Sorry for that....I guess there is no remedy. Much easier with the electronic counterparts....
by glovisol
Wed Mar 20, 2019 4:55 pm
Forum: SDRuno
Topic: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!
Replies: 9
Views: 286

Re: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!

In areas with strong & very strong FM Broadcast stations the MW/FM notch filter is a very effective tool in eliminating wideband noise killing receiver sensitivity at frequencies above 108 MHz. This noise is caused by SDR front end overload by very strong incoming local FM stations. The picture ...
by glovisol
Wed Mar 20, 2019 12:30 pm
Forum: Spectrum Analysis
Topic: Spectrum Analyser - New release available soon
Replies: 26
Views: 7971

Re: Spectrum Analyser - New release available soon

Very many thanks, Steve!! I plan to develop more filters for the RSP receivers with the help of your RSP-SAS software...

Kind regards,

glovisol
by glovisol
Tue Mar 19, 2019 6:48 pm
Forum: SDRuno
Topic: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!
Replies: 9
Views: 286

Re: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!

Yes, case closed...it all came about just because I was talking about scanning VHF here and therefore I misunderstood the scope of your post. In any case I hope our discussion was useful to bystanders!
by glovisol
Tue Mar 19, 2019 5:37 pm
Forum: SDRuno
Topic: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!
Replies: 9
Views: 286

Re: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!

1) If the point is that we are talking abot Scanner and scanning, I do not see the scope in scanning to receive VOR and/or other fixed signals. You know they are there, you can tune and copy them, end of the story. If they are weak, they are weak, but if you receive them at - 118 dBm (I guess becaus...
by glovisol
Tue Mar 19, 2019 3:30 pm
Forum: SDRuno
Topic: APRS Interference on 144.240Mhz
Replies: 4
Views: 143

Re: APRS Interference on 144.240Mhz

joseb, glad that things improved considerably, but you forgot to mention if you were using the new SDrplay Ver. 1.3 or older versions...
by glovisol
Tue Mar 19, 2019 2:53 pm
Forum: SDRuno
Topic: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!
Replies: 9
Views: 286

Re: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!

I wonder about what kind of antenna you are using if the very low insertion loss of the built-in notch impedes reception of signals in the Airband. Please consider the following, which is based on theory and on PRACTICAL EXPERIENCE as well. 1) Signals in the airband come from high flying aircraft, s...
by glovisol
Tue Mar 19, 2019 11:59 am
Forum: SDRuno
Topic: Ghost program on WFM - RSPduo
Replies: 2
Views: 75

Re: Ghost program on WFM - RSPduo

In order to avoid front end overload, you should insert a 20 dB attenuator between antenna lead & RSP input. This is not necessary with other SDR because most probably they are less sensitive.
by glovisol
Mon Mar 18, 2019 3:14 pm
Forum: SDRuno
Topic: Scanning the 2M Ham band
Replies: 6
Views: 346

Re: Scanning the 2M Ham band

Hi Hugo,

Forgive me for this (perhaps stupid & obvious question...) did you switch the MW/FM notch filter IN when attempting to scan the 2 m band? In my experience the Scanner works faultlessly....so there must be something obviously wrong on your side.

Cheers,

glovisol
by glovisol
Mon Mar 18, 2019 3:10 pm
Forum: SDRuno
Topic: IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!
Replies: 9
Views: 286

IMPORTANT WHEN SCANNING VHF WITH SDRuno VER.1.3!

Hallo all, What follows will seem obvious to many, nevertheless it costs nothing to post this warning. When scanning above 30 MHz ALWAYS USE THE MW/FM NOTCH FILTER. In areas with strong or very strong FM stations (e.g., all over!) the SDR receiver front end will be surely knocked off to overload &am...

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