Search found 34 matches

by NK7Z
Mon Oct 08, 2018 3:47 am
Forum: General
Topic: Noise?
Replies: 2
Views: 206

Re: Noise?

Probably a switching mode power supply... See:
https://www.nk7z.net/sdr-rfi-survey-p1/
for a bit on how to ID some of this stuff.

Also see:
https://www.nk7z.net/rfi-snapshots/

for an ever growing catalog iof RFI sources.
by NK7Z
Mon Oct 01, 2018 2:55 pm
Forum: General
Topic: Test to determine if receive damaged?
Replies: 7
Views: 649

Re: Test to determine if receive damaged?

Hi Franko,
There are several types of service monitors, if it is a good 2-way shop they will know what you are asking for... I have an IFR, but as I mentioned, there are many types, by several makers...
by NK7Z
Sun Sep 30, 2018 7:20 pm
Forum: SDR Antennas
Topic: Loop antenna for SDR question
Replies: 1
Views: 224

Re: Loop antenna for SDR question

Why not build one, they are mindlessly simple to build, save yourself a ton of money.
by NK7Z
Sun Sep 30, 2018 6:28 pm
Forum: General
Topic: Some thoughts and observations on the RSP1a and EMI
Replies: 1
Views: 319

Re: Some thoughts and observations on the RSP1a and EMI

Hi,
I just ran across this, thanks for the link back to my site! Have you been able to generate a heatmap of RFI yet? That is a project I want to either help with, or start...
by NK7Z
Sat Sep 08, 2018 9:18 pm
Forum: General
Topic: Test to determine if receive damaged?
Replies: 7
Views: 649

Re: Test to determine if receive damaged?

Contact a 2-Way shop in your area, ask if they can use the service monitor they all have to test the rigs sensitivity. If you are in Oregon, I have one and can assist.
by NK7Z
Fri Jul 06, 2018 4:10 pm
Forum: SDR Antennas
Topic: magnetic loop and pre-amp?
Replies: 5
Views: 1338

Re: magnetic loop and pre-amp?

I have been using my three diameter loop with my SDRPlay RSP-1 without a preamp for a few weeks now... I see all sorts of signals. If you are seeing nothing, check your loop construction. You should hear a pronounced increase in background noise as you tune through resonance. Make sure you are liste...
by NK7Z
Fri Jun 29, 2018 1:42 pm
Forum: SDRplay related
Topic: Earthing my new SDRPLAYduo
Replies: 1
Views: 495

Re: Earthing my new SDRPLAYduo

I have mine tied to the station ground, which is a eight foot ground rod, and that ground rod is tied to the service entrance ground for electrical. Multiple grounds, not tied together, scare me.
by NK7Z
Fri Jun 29, 2018 1:39 pm
Forum: General
Topic: RF "surges"
Replies: 3
Views: 603

Re: RF "surges"

I am using HDSDR, and had the same issue. I killed the AGC, and added an attenuator on the input of the RSP-1. I try and keep the input levels reasonable to the radio using the attenuator. I also keep the system gain as low as I can for whatever I am doing at the time. I further added an AM broadcas...
by NK7Z
Sat Jun 16, 2018 12:55 pm
Forum: Spectrum Analysis
Topic: Feedback for version 0.9a here
Replies: 185
Views: 23325

Re: Feedback for version 0.9a here

I was showing a friend in the communications business the Spectrum Analyser, and his first question was, is there a way to hear the signal? I did not find a demod, did I miss it?
by NK7Z
Wed Jun 13, 2018 2:48 pm
Forum: Spectrum Analysis
Topic: Feedback for version 0.9a here
Replies: 185
Views: 23325

Re: Feedback for version 0.9a here

Take a look at:

http://www.radio-electronics.com/info/t ... alyzer.php

that will get you started. Be sure to hit "Next" at the bottom of the first page.

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