Search found 35 matches

by Aussie Susan
Thu Jun 21, 2018 3:03 am
Forum: RTL-SDR Discussion
Topic: can't download WxtoIMG
Replies: 7
Views: 3624

Re: can't download WxtoIMG

Also be aware that the developer would appear to have disappeared a number of years ago and is not responding to messages. The last time I saw the original page it had license keys on it (which seemed to indicate the owner was making the project free to use the full version) but these stopped workin...
by Aussie Susan
Mon May 14, 2018 3:30 am
Forum: RTL-SDR Discussion
Topic: custom 400-406 MHZ bandpass filter?
Replies: 3
Views: 1467

Re: custom 400-406 MHZ bandpass filter?

I agree with Username - that interfering signal is just too close for a filter up at those frequencies. Even a crystal resonator won't have the cut-off required. What you might be able to do is to use your SDR and shift the whole signal down the band so that the bandwidth of the radiosonde signal is...
by Aussie Susan
Thu Apr 12, 2018 4:05 am
Forum: Off-Topic
Topic: Are websdrs, spyservers etc... legal?
Replies: 9
Views: 5814

Re: Are websdrs, spyservers etc... legal?

Not just retransmit but pass on the information received in any way. Courts (including those in NZ as I recall from my time as an Ham radio operator there) have been known to take a very broad interpretation of terms such as 'reproduce' in the act when it suits them. Basically it assumes that all ra...
by Aussie Susan
Tue Apr 03, 2018 3:53 am
Forum: Troubleshooting Help
Topic: Shifted WXtoIMG images.
Replies: 3
Views: 2125

Re: Shifted WXtoIMG images.

Check out http://www.wxtoimg.com/support/wxfaq.html
There is a section in "Image Slant"
Susan
by Aussie Susan
Wed Mar 14, 2018 1:41 am
Forum: Troubleshooting Help
Topic: poor quality noaa images
Replies: 2
Views: 2004

Re: poor quality noaa images

Check out http://www.wxtoimg.com/support/wxfaq.html and look at the "Image Slant" section.
Susan
by Aussie Susan
Wed Feb 28, 2018 2:05 am
Forum: Antennas
Topic: Where do the antenna actually begin?
Replies: 8
Views: 5763

Re: Where do the antenna actually begin?

Another answer could be that neither of these are where the antenna begins because you are using shielded wire and to it is only carrying the signal to where the antenna really is! And yes I know that the cable does have an effect. However at 1.06GHz, the wavelength is about 270mm in free space and ...
by Aussie Susan
Tue Feb 27, 2018 1:14 am
Forum: Antennas
Topic: Where do the antenna actually begin?
Replies: 8
Views: 5763

Re: Where do the antenna actually begin?

Depending on the frequency, I would say that it probably makes no difference. Given the frequency you can work out the wavelength (I'd multiply it by something like 0.8 as this is wire and not free space). If the wavelength is more than a cm or two then the result will be the same no matter where yo...
by Aussie Susan
Mon Feb 26, 2018 2:44 am
Forum: Antennas
Topic: Is it normal for an antenna not have lowest swr in its advertised band?
Replies: 7
Views: 4662

Re: Is it normal for an antenna not have lowest swr in its advertised band?

The scale you are using is quite large. I guess the real question is, does it have the SWR that the manufacturer stated at the frequency of interest? If it does then you have what you bought. If not then you might have a case for misleading advertising and getting your money back (certainly here in ...
by Aussie Susan
Mon Jan 29, 2018 2:56 am
Forum: RTL-SDR Discussion
Topic: unknow radio stations on 27 mc
Replies: 4
Views: 2952

Re: unknow radio stations on 27 mc

Isn't that Citizen Band?
Would not explain the long distance though...
Susan
by Aussie Susan
Thu Jan 25, 2018 5:27 am
Forum: Off-Topic
Topic: NSA Tracking of powered down cellphones and other wireless devices
Replies: 7
Views: 20581

Re: NSA Tracking of powered down cellphones and other wireless devices

What you are describing (bounding a strong enough signal off a 'dead' device) is basically what I was mentioning above about the RFID chips. The trick is to know the appropriate frequency before hand. For the RFID chips that is easy as they are designed to respond to a given frequency. For other dev...