Coordinates wrong...and a few other questions

[datastreem]

Hi people,

Finally got round to getting a Pi, woop! great stuff, over the moon that I can start feeding again.

I have an old EUROSTICK DX 25-2000MHz BASE SCANNER ANTENNA, attached up on the chimney, it's 25 - 2000MHz and I believe that the radio signals are 1060MHz, So I should be good to go with that?

Also, no way on earth can I get my feed to work on USB/Beast it has to be TCP even though that goes against the instructions.....as long as it's online does that matter?

And one last thing, I can never get the coordinates correct as I live in a -1 area, I've for years always struggled to find the correct settings for the dump1090 etc. Any help on that would be super.

Thanks again.

[ylis]

I can never get the coordinates correct as I live in a -1 area

Do you mean -1 timezone or 1 degree west ?

[Oblivian]

If you have a beast. You need to also specify USB settings. Or is it a USB DVBT device?
For instance /dev/ttyUSB0 is needed for an actual BEAST
And the port speed.

Or if you have something that uses Dump1090, there may be some extra arguments to specify - What software install method did you use.

As for the antenna, correct frequency is 1090. Right at the top end of that antenna. Although it *may* work, it isn't optimised so performance will likely be better with a simple 67mm wire.

For the co-ords, find your location in maps.google.com and the correct format appears in the address bar link, only need the first 3 decimals from memory.

Adjust them on fr24 vs local map is a different thing, Which bit do you think is currently set incorrect.

[datastreem]

Thanks for the help, I think I'm all sorted, followed your install help pages on hear, I have the USB DVB-T Realtek RTL-2838, I edited the "dump1090" file, rebooted and all good, it's just the initial set up, when it asks you to input it as a "XX.XXXXX" and I start of with "-1 degree west......"

Hoping the aerial will work, it be a shame wasted, had an old radio on there......

[datastreem]

Wow, I chopped that little indoor aerial down and seen the range now! amazing!

27-05-2020 08-59-54.jpg

[Oblivian]

Not too short I hope! That 67mm I said may not be accurate best to verify on the antenna thread, meant to take into account the base too.

But if you noticed it, has to be a good thing

[datastreem]

Thanks yeah I seen the thread and the pics about taking into consideration the bit that's in the base, I'm well chuffed, I haven't got my connection yet to test the one that's up on the chimney, but amazing results just of chopping it.....

[datastreem]

can I just ask one more question? the Mhz of the antenna is 25-2000MHz, and if the planes are 1090, you know when you say "right on the border" for the frequency? surly this is only middle of it's range?....

Thanks

[Oblivian]

1090Mhz is only 10Mhz off the top end max tuned range. On a wide band, the middle is likely to be far better as gain drops to the lower/upper edges.
Because they are designed for sensitive tuned front ends that are in scanners it matters a bit less.
ADSB is a bit of an exception as it is near microwave/cellular and the USB sticks are not as sensitive or get flooded/overlapped.

Much like the fitpower tuners that can't do 1090 as they are not sensitive enough/able to properly shift to 1090 at the outter end

Mobile phone towers range from 850Mhz-1.5Ghz (1050Mhz) often have spill that the sticks get which is why some also have issues with nearby tower noise. Having a broad antenna that covers that can have a adverse effect

But like I said, you won't know unless you try it. But a tuned one, is usually always better than a broad range

[datastreem]

Thanks, I'm learning all the time, sorry if that was a super n00b question, I'll have to have a read back over you post and do some reading up on it.

Great stuff, thanks

[datastreem]

thought I'd drop you a picture in...

sTlqhIj.jpg

LB32WJQ.jpg

I thought I'd give the tin can a go but it didn't look to good in the morning.......

RXECzhU.jpg




UZx7cBh.jpg

[abcd567]

Trial Run Results for Four Sizes of Ground Planes


Trial Run Results for Three Types of Whip Antennas

[datastreem]

thanks man, it's dead interesting.......that's the tuts that I followed about cutting the antenna.....

[datastreem]

Tin can added 3.00am.....here's the results....

NGXe6OS.jpg

JqPh2eR.jpg

[ylis]

Re the picture of the modified whip - the wire wrap used is likely adding additional inductance and capacitance ( L & C ) to the "electrical" length of the antenna.Not known what this would be at 1090MHz but it could affect the recommended 67mm.