 Posted:  Wed Apr 11 2012, 01:49am | |
| Posted by: Dave3825us | Posts: 1219
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Old Display Name: Dave
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 Premium Member | Joined: Fri Mar 24 2006, 10:47pm
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I made this a while ago and it was tuned for the 155 MHz range, used for a weather radio I have. On Easter, I ran across this home brew and decided I wanted to see if I could improve my reception range.
I live in East islip and have only my rs 800 duck. I, from here, lost fdny, nypd, doitt uhf, ncpd , ncfd, I was only getting scpd trs, a good amount of uhf fire depts (barely got vhf) and maybe Mta pd if they were close....
I cut the elements from 18' to 6 1/2. I left the 1/2 to make the round ends to avoid losing an eye. So it resonates around 460MHz. It kinda gets funky from here and I know the more connectors is bad, but, sma to bnc, bnc to F, F to F, to pl 259 to pl 259 chassis mount that the ant is constructed of. All this attached to my Br330t. I did find pl 259 to bnc and its on the way..
Results are very good. From in my apartment, I can hear NYPD, FDNY Uhf. Some Nassau fd's, and NCPD if scanners in the right spot. I now pick up fire depts I never used to and others that were fuzzy are pretty clear.
Today I was in Levittown and reception was not great, due to this being cut for 460Mhz, but was actually listening to fres and special 1 on the scpd trs.
Ground Plane
Use a UHF chassis- mount connector and #10 or #12
solid copper wire (regular house wiring stuff or
welding rod).
Approx. length of all elements:
120MHz=23", 155MHz=18"
460MHz=6", 855MHz=3-1/4"
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| Posted: Wed Apr 11 2012, 06:21pm | |
| Posted by: ipfd320 | Posts: 1864
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| Location: Martin County Florida
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Account terminated as requested
| Joined: Sat Mar 31 2007, 02:05am
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Ok now that You told us How it Works....How About some Pictures of This
i,d be interested to see the Outcome |
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| Posted: Wed Apr 11 2012, 08:08pm | |
| Posted by: LI_Scan_Guy | Posts: 255
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| Premium Member | Joined: Tue Jun 01 2010, 06:34pm
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You know the old expression - something is better than nothing. You replaced your "nothing" rubber duck antenna with something you can move to a better location to get better reception. A simple wire cut to the proper frequency might have worked well too. Many hams use the ground plane you described as a decent homebrew antenna. There is no gain, but by placing the antenna outside on your roof you've increased your range because "something" is better than "nothing" This is most likely what was built [link]
[ Edited Wed Apr 11 2012, 08:11pm ] |
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| Posted: Thu Apr 12 2012, 12:03am | |
| Posted by: Dave3825us | Posts: 1219
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Old Display Name: Dave
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| Premium Member | Joined: Fri Mar 24 2006, 10:47pm
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Maybe au mod can rotate this. Im on thethe road on android.... Not very pretty, but it works...
[ Edited Thu Apr 12 2012, 12:08pm ] |
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| Posted: Fri Apr 27 2012, 06:49pm | |
| Posted by: Dave3825us | Posts: 1219
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Old Display Name: Dave
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| Premium Member | Joined: Fri Mar 24 2006, 10:47pm
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So, from east islip, with stock ant I could not hear nassau pd or east farmingdale fire depts. With this antenna, if I went outside, I could just get them. Now, I added my amp and effd and nassau police are coming in with 2 to 3 bars and just a little static. I wish my pc set up was near my front window.
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| Posted: Fri Apr 27 2012, 07:23pm | |
| Posted by: ipfd320 | Posts: 1864
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| Location: Martin County Florida
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Account terminated as requested
| Joined: Sat Mar 31 2007, 02:05am
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| wow im using a regular cable tv 110 volt plug in amp for my set up...been using my throw together crap for years without a problem....signals improved considerably |
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| Posted: Fri Apr 27 2012, 07:32pm | |
| Posted by: Dave3825us | Posts: 1219
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Old Display Name: Dave
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| Premium Member | Joined: Fri Mar 24 2006, 10:47pm
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| This has a wal wart that powers it with 12 volts 200milliamps. I need to make a 12 cig plug for it that puts out 200 milliamps and use it in my truck..I must say it rocks... |
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| Posted: Fri Apr 27 2012, 08:12pm | |
| Posted by: ipfd320 | Posts: 1864
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| Location: Martin County Florida
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Account terminated as requested
| Joined: Sat Mar 31 2007, 02:05am
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| the wall wart decible strength isn,t as good as the 110 big box as i call it...believe me i tried alot thru the years |
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| Posted: Fri Apr 27 2012, 09:24pm | |
| Posted by: Dave3825us | Posts: 1219
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Old Display Name: Dave
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| Premium Member | Joined: Fri Mar 24 2006, 10:47pm
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I have one of those 110 volt ones . does it look something like this?
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| Posted: Fri Apr 27 2012, 09:54pm | |
| Posted by: ipfd320 | Posts: 1864
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| Location: Martin County Florida
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Account terminated as requested
| Joined: Sat Mar 31 2007, 02:05am
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try it out what have you got to lose
mine is older version with a 4 output
USE the 1 with the Gain PORT and turn it all the WAY UP then PLAY with the TRAP on an Incomming Station which would Sound Better
[ Edited Fri Apr 27 2012, 09:57pm ] |
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