G8JNJ

@Lonecrow

Two things make a difference to the Mini-Whip signal level. The height above 'ground' and the length of the actual Whip element.

PA3FWM has some good notes on the subject.

http://www.pa3fwm.nl/technotes/tn07.html

Regards,

Martin - G8JNJ

Yes, unfortunately you have two massive AM broadcast signals on 760KHz and 800KHz.

As a temporary measure try attenuating the input signal by about 10dB.

A longer term fix is to build a notch, or high pass filter to reduce the level of the BC stations without reducing the level of other signals.

Some notes on the subject can be found towards the top of this web page.

https://www.g8jnj.net/softwaredefinedradio.htm

Regards,

Martin - G8JNJ

Hi Ron,

The reduction in IP products with improved amplifier balance are likely to be mostly 2nd order products.

One trick you could try is to place a 1:1 voltage balun (a pair of bilfilar windings with the end of winding one connected to the start of winding two ) across the amplifier input with the center tap to ground. You may need to experiment with the number of turns and type of ferrite but this is likely to be just as effective (and easier to construct) as an isolating input transformer with a grounded center tap on the secondary (amplifier input) side.

Regards,

Martin - G8JNJ

This thread covers splitting GPS feeds.

http://forum.kiwisdr.com/discussion/comment/3949#Comment_3949

Another success today - I emailed Esteban, EA8DGL, and asked if he could enable his GPS as he's in a great location for TDoA in the Canary Islands just of the West coast of Africa.

He very kindly did this today and he's now appearing on the TDoA map :-)

The other good news is that he's just got his Amateur licence and permission to put a better antenna up, so hopefully reception will soon be even better.

My thanks to Esteban for doing this.

If anyone else feels like emailing other KiWi owners in key locations that would be very helpful too.

Maybe we should compile a 'hit' list ?

Regards,

Martin - G8JNJ

"How does anyone feel about the possible addition of a limit to how many receivers may run TDoA"

Seems like a sensible idea to me.

There may also be potential political problems in some countries e.g. if a KiWi on 'their' territory is used to TDoA military facilities.

On a similar subject - I notice that users IP addresses are now no longer shown on the KiWi GUI (they may still be logged) but just the approximate location instead. I think this is sensible too.

Regards,

Martin - G8JNJ

I haven't TDoAed the two VLF sites, but I thought it was worth adding them to the map prior to trying.

Wilhelmshaven is the result of a TDoA of a STANAG transmission on 12176KHz USB. Unfortunately I didn't save the setup.

Regards,

Martin - G8JNJ

I'm quite pleased with this one, especially as it's an HF signal and there are not that many suitably placed KiWi's.

It's a Russian CIS-12 signal on 11175KHz.



Regards,

Martin - G8JNJ

I'm quite pleased with this one, especially as it's an HF signal and there are not that many suitably placed KiWi's.

It's a Russian CIS-12 signal on 11175KHz.



Regards,

Martin - G8JNJ

I'm quite pleased with this one, especially as it's an HF signal and there are not that many suitably placed KiWi's.

It's a Russian CIS-12 signal on 11175KHz.



Regards,

Martin - G8JNJ