Search found 64 matches

by NoelC
Mon Jan 16, 2017 6:27 pm
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 3051

Re: Frequency Sweeps? What? Who?

Why is that? HF propagation is magic, you know. You can bounce around the globe using milliwatts if the conditions are right. Conditions are only that right occasionally. Since I see so many sweeps, even when conditions are only marginal, I can only assume it's either that there are a lot of these ...
by NoelC
Mon Jan 16, 2017 11:15 am
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 3051

Re: Frequency Sweeps? What? Who?

So either those things are incredibly common (to where I and the various WebSDR sites are always near some) or they shoot signals with a lot of power up into the sky. I'm presuming the latter... Why do they need a lot of power to characterize the ionosphere? And isn't it illegal to blast QRM all acr...
by NoelC
Sun Jan 15, 2017 11:27 pm
Forum: General
Topic: Frequency Sweeps? What? Who?
Replies: 13
Views: 3051

Frequency Sweeps? What? Who?

Before having an SDR with this wonderful waterfall model I used to hear the occasional sweep of a beat frequency and just figured it was someone from a nearby band tuning up or something. Now I realize that there are these frequency sweeps going on all the time across the HF band, usually ascending ...
by NoelC
Sat Jan 14, 2017 4:36 am
Forum: General
Topic: RSP2 Upgraders - What Do You Find Better than RSP1?
Replies: 6
Views: 1720

Re: RSP2 Upgraders - What Do You Find Better than RSP1?

Thanks. I read that article... Maybe what I don't know won't hurt me, since I don't really want to manage another separate antenna. The EF-SWL antenna I've set up is doing a great job, frankly, across the entirety of the RSP1's range. I'm quite often able to run the SDRuno IF Gain reduction all the ...
by NoelC
Fri Jan 13, 2017 5:15 pm
Forum: SDRuno
Topic: SDRUno RSP1 NB doesn't do much
Replies: 6
Views: 4489

Re: SDRUno RSP1 NB doesn't do much

For what it's worth I just had a situation where the NB filter made a COMPLETELY unusable signal into something readable and actually quite clean. I found Trenton Military Weather, USB on 15.034 MHz, completely unreadable because our washing machine has a computer control board that insists on broad...
by NoelC
Fri Jan 13, 2017 4:54 pm
Forum: SDRuno
Topic: Squelch in relation to gain reduction
Replies: 1
Views: 636

Re: Squelch in relation to gain reduction

I have to agree. There are several feature couplings that there shouldn't be. And since it is software, it seems like they should be fixable. Another one is the Noise Blanking setting. IF Gain changes affect its threshold, when it would really be nice if there was some factor in there that would tak...
by NoelC
Fri Jan 13, 2017 4:39 pm
Forum: General
Topic: RSP2 Upgraders - What Do You Find Better than RSP1?
Replies: 6
Views: 1720

Re: RSP2 Upgraders - What Do You Find Better than RSP1?

How, physically, do you bring antenna wiring to the Hi Z input? Just curious. It's fairly urban here and there are FM stations, several close by, completely filling the band - yet I'm not seeing a whole lot of what I would call FM "sproggies" or interference I don't think. Mostly what I se...
by NoelC
Fri Jan 13, 2017 2:21 pm
Forum: General
Topic: RSP2 Upgraders - What Do You Find Better than RSP1?
Replies: 6
Views: 1720

Re: RSP2 Upgraders - What Do You Find Better than RSP1?

Thanks for the insight, 13dka. I wonder how many quirks might be due to the newness of the RSP2 design, and how many are just going to stay there. From what I can see the RSP1 is not without a few quirks itself. On the other hand I have no idea how many they may have fixed since the first box rolled...
by NoelC
Thu Jan 12, 2017 11:45 pm
Forum: SDRuno
Topic: What is "Decimation"?
Replies: 8
Views: 2506

Re: What is "Decimation"?

Forgive me, but it's soaking in more slowly than I'd like. I'm fairly technical but have no background in radio and especially in the concepts of SDR. I have this feeling it will fall into place if I can get just a few more pieces of the puzzle in place... You're saying Decimation causes multiple su...
by NoelC
Thu Jan 12, 2017 7:35 pm
Forum: SDRuno
Topic: Initial Frequency On Startup Distorted
Replies: 7
Views: 1529

Re: Initial Frequency On Startup Distorted

Maybe it's an SDRuno thing, but when tuned to the center scale frequency and Zero IF is selected I don't see a notch so much as a ghost signal that distorts the reception. The sound for USB isn't bad, because the low frequencies are excluded, but AM stations just sound distorted. Examples: Center sc...

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