Search found 350 matches

by g1hbe
Wed Sep 19, 2018 10:24 pm
Forum: SDRplay related
Topic: RSP-1 as a bat receiver?
Replies: 5
Views: 2362

Re: RSP-1 as a bat receiver?

My detector is a self-contained one with a pre-amp, mixer and audio amp driving a small speaker. There's high-pass filtering in the pre-amp and low-pass in the audio amp so there's no 'howl round' from speaker to mic. The local oscillator is tunable over approx 15 to 40 KHz. I've recently found a ra...
by g1hbe
Wed Sep 12, 2018 11:50 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 50
Views: 5748

Re: Testing RSPduo receiver sensitivity with noise generator

Glovisol, has something gone amiss with your calcs? Those attenuators won't be anywhere near 46 dB. You'd need about 5k in series.
by g1hbe
Tue Sep 11, 2018 4:15 pm
Forum: General
Topic: RSP1 not detecting frequency
Replies: 6
Views: 254

Re: RSP1 not detecting frequency

Simplest way is to click the tuning cursor to one side of the centre LO frequency, then type in your required frequency (or tune there with your mouse wheel). You can hover your mouse over the digit you want to change and then use the wheel.
by g1hbe
Tue Sep 11, 2018 3:01 pm
Forum: General
Topic: RSP1 not detecting frequency
Replies: 6
Views: 254

Re: RSP1 not detecting frequency

Select AM mode and the 6 KHz bandwidth setting. Or wider if there are offsets in use. Also make sure your receive frequency and the displayed LO frequency are NOT the same. If they are you will get weak reception and distortion. This catches out a lot of beginners!
by g1hbe
Mon Sep 10, 2018 7:42 am
Forum: New Users' experiences
Topic: Absolutely Green New User
Replies: 5
Views: 677

Re: Absolutely Green New User

In the early days of SDRUno frequency entry was KHz only, and entering a VHF frequency ended in strings of zeros. Very awkward. Now you can enter as MHz or KHz. There's a MHz button on the keyboard so you can just enter 95.5 <MHz> and the job is done. For 1530 KHz, just enter 1530 <enter>. People st...
by g1hbe
Wed Sep 05, 2018 11:37 am
Forum: SDRuno
Topic: What's the difference between SDRUno and SAS?
Replies: 2
Views: 313

Re: What's the difference between SDRUno and SAS?

If you are not into serious test & measurement, you won't need the Spectrum Analyser software. Although an SA is basically a radio receiver, the user interface is more suitable for measurement and analysis (with features such as max/min hold etc) than the standard Uno-type software. Actually Uno...
by g1hbe
Tue Aug 28, 2018 7:24 am
Forum: SDR Antennas
Topic: 1/4 wave for 20 meters
Replies: 3
Views: 465

Re: 1/4 wave for 20 meters

Half waves are high impedance feed so you can get away with no ground. If your RX has a Hi-z antenna port it will match quite well.
by g1hbe
Mon Aug 27, 2018 10:50 pm
Forum: SDR Antennas
Topic: 1/4 wave for 20 meters
Replies: 3
Views: 465

Re: 1/4 wave for 20 meters

Seventeen feet is about right, but remember you'll need an earth/gnd.
by g1hbe
Mon Aug 27, 2018 7:24 am
Forum: SDRuno
Topic: SDRUno selected tuner/port startup bug with RSPDuo?
Replies: 1
Views: 270

Re: SDRUno selected tuner/port startup bug with RSPDuo?

Sounds like either no-one else has had this problem or no-one knows how to correct it. Try opening a ticket over at the main SDRPlay site. I think it's in the 'support' tab.
by g1hbe
Sun Aug 19, 2018 11:42 pm
Forum: SDRuno
Topic: SDRuno MW/FM Broadcast Notch
Replies: 7
Views: 703

Re: SDRuno MW/FM Broadcast Notch

If you take a look at the block diagram, you will see that the Hi-z antenna goes in at a much later stage than the A and B ports, bypassing the filters and notches. It's a bit of a mixed bag - it misses out on the filtering and notching, but it's actually a quieter receiver better suited to HF and l...

Go to advanced search