Search found 137 matches

by ON5HB
Sun Jul 21, 2019 4:08 pm
Forum: General
Topic: Always 125 MHZ Offset!
Replies: 5
Views: 162

Re: Always 125 MHZ Offset!

I could be wrong, but look for this screen and set it to 0.000 or remove the entry, see what happens:

Image
by ON5HB
Sun Jul 21, 2019 4:01 pm
Forum: SDR Antennas
Topic: "Low Noise" Vertical Antennas for Receiving
Replies: 3
Views: 185

Re: "Low Noise" Vertical Antennas for Receiving

Hi Bill, He makes a very interesting point, but sadly a wrong remark: While studying active whip intercepts some time ago I discovered, much to my amazement, that long coax (50 feet) lead often degrades 2 nd order intercepts of active whip antennas by 20 dB or more and degrades 3 rd order intercepts...
by ON5HB
Sat Jul 20, 2019 8:39 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 106
Views: 12305

Re: Receive Antenna & Impedance "Matching"

Well you say the same as I but in more detail. But I do not agree with 1 point, and that is the noise-floor. WSPR will go under the noise (whatever DBM it is) by -33. Mostly the noise on the band is pretty high, so most receivers have no problem capturing it. In short....WSPR goes below noise by 33d...
by ON5HB
Sat Jul 20, 2019 8:27 pm
Forum: General
Topic: AM and FM Band Reject Filters
Replies: 5
Views: 153

Re: AM and FM Band Reject Filters

I have used filters and attenuators before, all the time mixing started on big signals. Ending up with AM stations as high at 40m....no joke. Checkout my websdr: http://heppen.be:8091 There are NO AM stations repeating, not a single one as far as I know. That is due to the up-conversion. Everything ...
by ON5HB
Sat Jul 20, 2019 5:53 pm
Forum: Spectrum Analysis
Topic: Spike in Center??
Replies: 1
Views: 496

Re: Spike in Center??

Change the IF-type.
Normally we use Zero-IF, but spikes can arise, if you have a problem, try other IF.
by ON5HB
Sat Jul 20, 2019 5:15 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 106
Views: 12305

Re: Receive Antenna & Impedance "Matching"

However, if my input can be worth 2 cents, please understand that, among the RSP's the RSP-1A is not the best choice for the activity you are doing. The RSP2 or (better) the RSPduo with their HI Z imputs exhibit a tested noise figure that is from 6 to 9 dB better in HF than that of the RSP-1A with ...
by ON5HB
Sat Jul 20, 2019 4:55 pm
Forum: SDRplay related
Topic: SDRplay transceiver?
Replies: 3
Views: 228

Re: SDRplay transceiver?

Hi John,

It will be too expensive, as for just 1200 euro/dollar you can get the Icom7300 and does everything up to 70MHz.
I doubt you can beat that.

I have looked at Anan and the price blew me out of the pond. Just too expensive.
They all are and they do not offer much over the 7300.
by ON5HB
Sat Jul 20, 2019 4:50 pm
Forum: General
Topic: AM and FM Band Reject Filters
Replies: 5
Views: 153

Re: AM and FM Band Reject Filters

Hi Bill, I had the same problem here. My solution was to use an 125MHz upconverter as it looks like the very low frequencies tend to puckup AC from solarpanels and it's near to impossible to get rid of them. I use this: https://www.nooelec.com/store/media/catalog/product/cache/1/image/1200x/040ec09b...
by ON5HB
Sat Jul 20, 2019 4:06 pm
Forum: Code Corner
Topic: LAN sever setup of RSP1a
Replies: 1
Views: 143

Re: LAN sever setup of RSP1a

Most simple way is to install: https://sdr.hu/openwebrx I also believe they have a way to connect to the RSP1A with SoapySDR. Typical it can handle about 2-4 users at the same time. However, the Pi4 and Asus Tinkerboard may be too light to handle it, you have to try and find out. As for putting it o...
by ON5HB
Sat Jul 20, 2019 4:02 pm
Forum: Code Corner
Topic: Resampling
Replies: 20
Views: 12211

Re: Resampling

n2ic wrote:At the risk of showing just what a poor developer I am ...


Join the club, me too :lol:

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