Suggested Amp (Read Cheap)

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w7psk
Posts: 22
Joined: Sun Jun 08, 2014 3:44 pm
Location: Everett, Washington

Suggested Amp (Read Cheap)

Post by w7psk » Fri Jun 27, 2014 4:50 pm

Looking for a preamp and Ive poured through all the TONS of data and have not come up with anything Solid yet. Plus I would need a Power insertion Circuit ...

Just any suggestions would be nice.

Here is the Dongle Im using .. It goes out through 12m of RG6 to a 8 elem Coaxial I made.

http://www.amazon.com/gp/product/B00C37 ... UTF8&psc=1

Also here is my Current plot. Range Rings are 40km.
Attachments
Range Map.jpg
Range Map.jpg (249.45 KiB) Viewed 5173 times

jonfear
Posts: 365
Joined: Sat Feb 09, 2013 12:15 pm
Location: Wick St Lawrence
Contact:

Re: Suggested Amp (Read Cheap)

Post by jonfear » Fri Jun 27, 2014 6:20 pm

Hi

You may wish to take a look at this..http://forum.planefinder.net/threads/ad ... .23/page-5 You may need to register.

I have made a few of these for my co-linears.

I used a small die cast box from eBay, 2x F type chassis connectors.

Look at http://www.wslwx.co.uk/external for the pictures of mine. You can get SMA to F type adaptors cheaply on eBay again...

Hope this helps, I will write a how to at some point!

Jon
http://www.360radar.co.uk, the new name for MLAT Radar in the UK and Western Europe.

Former PP feeder Bm. No longer feeding. I do not have time to sort out imaginary problems with NTP
when it has been working fine for 2+ Years.

CharlieAlpha
Posts: 63
Joined: Sat Mar 15, 2014 6:41 pm

Re: Suggested Amp (Read Cheap)

Post by CharlieAlpha » Fri Jun 27, 2014 7:18 pm

Not sure if this is of interest or if you have already seen it in your tons of internet stuff

http://www.rtl-sdr.com/new-inline-low-n ... ification/

I can't make an claims about it. I just happened to see the post last night and bookmarked it for further investigation over the weekend.

I currently get about a max range of about 70mile at altitude with a simple "Franklin Co-linear" antenna made from coat hanger wire to the design on the first page of the link Jon provided; no pre-amps, 5m of cheap co-ax as the feed to a USB dongle. I am sure I could get better with a little more care, time and better quality materials it was just a first try to see if I could get better than the stock aerial that came with the dongle (seems slightly better; not an massive difference in range but general higher signal quality ratings on dump1090 and rtl-1090). The fact I am in a ground flat limit what I can do in terms of antenna.

Charlie

w7psk
Posts: 22
Joined: Sun Jun 08, 2014 3:44 pm
Location: Everett, Washington

Re: Suggested Amp (Read Cheap)

Post by w7psk » Fri Jun 27, 2014 7:41 pm

jonfear wrote:Hi

You may wish to take a look at this..http://forum.planefinder.net/threads/ad ... .23/page-5 You may need to register.



Jon
Signed up but plane finder wont let me view a larger picture. Says I dont have permission. Already verified the Email.

jonfear
Posts: 365
Joined: Sat Feb 09, 2013 12:15 pm
Location: Wick St Lawrence
Contact:

Re: Suggested Amp (Read Cheap)

Post by jonfear » Fri Jun 27, 2014 9:10 pm

Hi Charlie

The actual device used is very good. The gain is good and it appears to have a reasonable noise floor.

It could be quite difficult to put together by the average DIY'er. I do not see any built prices.

I think I will stick with my home-brew solution for the time being....

Thanks for finding and sharing.

Jon
http://www.360radar.co.uk, the new name for MLAT Radar in the UK and Western Europe.

Former PP feeder Bm. No longer feeding. I do not have time to sort out imaginary problems with NTP
when it has been working fine for 2+ Years.

jonfear
Posts: 365
Joined: Sat Feb 09, 2013 12:15 pm
Location: Wick St Lawrence
Contact:

Re: Suggested Amp (Read Cheap)

Post by jonfear » Fri Jun 27, 2014 9:11 pm

w7psk wrote:
jonfear wrote:Hi

You may wish to take a look at this..http://forum.planefinder.net/threads/ad ... .23/page-5 You may need to register.



Jon
Signed up but plane finder wont let me view a larger picture. Says I dont have permission. Already verified the Email.
It took a couple of hours for the permissions to come through. It will do hopefully soon.

Jon
http://www.360radar.co.uk, the new name for MLAT Radar in the UK and Western Europe.

Former PP feeder Bm. No longer feeding. I do not have time to sort out imaginary problems with NTP
when it has been working fine for 2+ Years.

GaryG
Posts: 60
Joined: Wed Jan 30, 2013 1:26 am

Re: Suggested Amp (Read Cheap)

Post by GaryG » Sat Jun 28, 2014 2:44 am

Hi

Not sure what you are using for an antenna but from what I've experienced, at 1090 MHz the antenna is probably your most important item. There are quite a few easy to build antennas. For a while, I used a quarter wave with radials quite successfully. Its best result gave some reception as far south as Anacortes from Vancouver, BC. I currently have a DPD Productions 1090 MHz antenna mounted at the same location and have seen as far south as Portland, OR. Eight element collinear antennas are fairly easy to construct and there are lots of plans with measurements available.

Keep in mind that 1090 MHz propagation is definitely line-of-sight and I am seeing somewhat lower ranges now that the trees have their leaves on the branches. Unobstructed elevation is your second best friend.

GaryG

gariac
Posts: 31
Joined: Sun Jan 13, 2013 6:25 am

Re: Suggested Amp (Read Cheap)

Post by gariac » Thu Jul 03, 2014 8:21 am

You can do about 140 statute miles with the crappy antenna that comes with the dongle.

I have a 1090MHz J-pole that works better than the DPD in side by side tests. It was tuned for 1090MHz with an Anritsu Sitemaster. On my list is to take a photo of it and measure it more accurately. However, I gave someone crude estimates of the dimensions and he gets about 200 statute miles, which is very close to the theoretical.

The thing the dongle doesn't like is interference. There is a lot of cellular not that far away from 1090MHz.

jonfear
Posts: 365
Joined: Sat Feb 09, 2013 12:15 pm
Location: Wick St Lawrence
Contact:

Re: Suggested Amp (Read Cheap)

Post by jonfear » Thu Jul 03, 2014 4:07 pm

All

This is from my Raspberry Pi using the cheap satellite amplifier and a 12 element co-linear using satellite cable:

The range rings are 25nm.

HTH

Jon
Attachments
Rpi2 Range.jpg
Rpi2 Range.jpg (165.21 KiB) Viewed 5133 times
http://www.360radar.co.uk, the new name for MLAT Radar in the UK and Western Europe.

Former PP feeder Bm. No longer feeding. I do not have time to sort out imaginary problems with NTP
when it has been working fine for 2+ Years.

w7psk
Posts: 22
Joined: Sun Jun 08, 2014 3:44 pm
Location: Everett, Washington

Re: Suggested Amp (Read Cheap)

Post by w7psk » Thu Jul 03, 2014 4:28 pm

Im running an 8 elem Coaxial Co-linear now and its about 2 feet above the peak of my roof. My range is 40 to 160 NM depending. I do have several Cellular towers around me so that may be a better action to find a filter rather than an amp. My previous posted range map I had the Bottom of the antenna against the roof peak. I added a 2ft section of PVC to get it above the roof. I also re-made the antenna with better connections and coax. Shows a slight improvement. The Gap South West I know is caused by my Ham Radio tower that is on my roof.
Attachments
Range Map.jpg
Range Map.jpg (246.25 KiB) Viewed 5130 times

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