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| |-+  Listener Forum (Moderators: dave, RonR)
| | |-+  New feed: BLM/WRI/NEL/N12/3N6
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Author Topic: New feed: BLM/WRI/NEL/N12/3N6  (Read 28482 times)
dave
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« Reply #90 on: November 26, 2013, 06:58:22 PM »

Well, I have time, and some math abilities. The patience and spectrum analyzer could be a problem. So I think I'm just going to assume it's 121.625 and leave everything alone.

The first step is to identify exactly what AWOS it is.  Then…read up on intermodulation products:

http://en.wikipedia.org/wiki/Intermodulation

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JohnN
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KBLM, KWRI, KNEL, 3N6, N12, ZNY


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« Reply #91 on: November 30, 2013, 02:15:27 PM »

Just caught the frequency the AWOS comes through on. It was 122.8, which is Lakewood's CTAF. According to AirNav, the nearest AWOS are BLM (121.625) and MJX (119.875), which is 17 nm from BLM.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
ferraraj
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« Reply #92 on: December 02, 2013, 08:31:57 PM »

I'm having a hard time figuring out...is 133.5 off the WRI scan now? 118.97 sure comes in nice smiley! This is the only feed that can hear 133.5, did you and Dave decide if it could be added permanently?...
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Feed Provider:
ZBW Boston Center (RKA10)
ZBW Boston Center (ART08/UCA09)
KEWR Twr/Gnd/Cl Dl
N90-EWR (Dep/ARD/North/MUGZY)
N90-LGA (EMPYR)
N90-Liberty (S)
N90-Liberty (W)
JohnN
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« Reply #93 on: December 02, 2013, 10:16:04 PM »

I've been trying to post from my phone, but I guess it's not working. I've been meaning to lock out 33.5, but I haven't gotten around to it. So yes, as of now, 33.5 is on the feed. I'm probably going to lock it out soon to free up the feed, until I get a 3rd scanner.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
JohnN
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« Reply #94 on: December 04, 2013, 07:35:04 PM »

Just found another Pro-2006 on ebay. No bids, currently at $9.99 and $20 shipping. I put a $10 bid, but I doubt I'll get it. If I were to get the 3rd scanner, my setup would be:

Pro-2006 #1           Pro-2006 #2  Bearcat 350A
KWRI                       118.975         KBLM
KNEL                        125.325         N12
McGuire Approach    133.500        3N6
McGuire Departure

Two of them would be hooked up to the Pi, on to my laptop. Hopefully no one else bids on the scanner, because I'm not really willing to go over $30 total right now.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
JohnN
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« Reply #95 on: December 04, 2013, 10:15:46 PM »

Well, I've been outbid. I knew it would happen. Does anyone have any recommendations of other scanners to look out for, besides the Pro 2006?
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
InterpreDemon
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« Reply #96 on: December 05, 2013, 02:31:47 PM »

Sure, the RS Pro 2050, the BC 780, 785 or plain 350

The bigger issue is that you will be knocking the signal down by roughly a half to the existing radios (or one of them) when you add this third radio. Best thing to do is determine which of the existing radios has better coverage (probably the CTAF) and split that line in two. The marginal ground stations you are picking up now will probably be gone after another 3dB drop in signal, so you need to organize your radios so that the weakest signals are on the radio at the top of the splitter chain. If the third radio is going to have 133.5, it might need to be on the first splitter in order to pick up the ground side and the most distant aircraft, with the second output on that splitter going to another splitter that feeds the other two radios. Some radios have better ears than others as well (even between two identical models), so you can put them further down the splitter chain. It takes time and experimentation to arrive at the configuration that gets most or all of what you want to hear, most or all of the time, and sometimes that can result in a rather elaborate setup.
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KJFK ARINC
KHPN ATIS
(KJFK) NY DEP Liberty East
HF CAR-A  3455/5550/6577/8846/11396
HF ARINC LDOC  6640/8933
HF NY VOLMET  6604

Complaints should be addressed to: City Hall
JohnN
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« Reply #97 on: December 05, 2013, 03:22:46 PM »

I forgot to factor in the loss of signal. I bet I would lose the ground communications if I split it again. I think I have room for a second antenna on the roof, just not room in the budget. I guess maybe I could ask Santa for another antenna and scanner.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
InterpreDemon
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« Reply #98 on: December 05, 2013, 07:57:20 PM »

If the radio and antenna are for 133.5 I think there is plenty enough Santa out here to deliver. Just make your list and set it out with the milk and cookies.
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Feed Purveyor:
KJFK ARINC
KHPN ATIS
(KJFK) NY DEP Liberty East
HF CAR-A  3455/5550/6577/8846/11396
HF ARINC LDOC  6640/8933
HF NY VOLMET  6604

Complaints should be addressed to: City Hall
JohnN
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« Reply #99 on: December 06, 2013, 11:12:06 AM »

I think there should be enough room on the roof for a second antenna, but I will have to check and make sure. Do you have any recommendations for a homemade antenna that would work about as good as what I have up there now?
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
JohnN
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« Reply #100 on: December 06, 2013, 08:00:47 PM »

There's something strange going on on 21.5... Almost sounds like a ray gun or something. I think it stopped now. Oh, ps. 100th post in this topic.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
InterpreDemon
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« Reply #101 on: December 06, 2013, 11:29:58 PM »

John, for VHF there are a number of home-brew choices that would probably outperform what you have now to the point where one antenna would do the job despite additional signal splitting. That bow-tie styled vertical dipole you have has a distorted gain pattern unless your mast is non-metallic, has less than unity gain, the primary objective being to handle all the typical scanner bands from 30 to 1300 mHz somewhat OK, and suffers losses from the 300/75 balun transformer. A decent VHF ground plane tuned and matched properly for our band on the top of your mast would almost certainly outperform it by at least the 3dB you are looking for and give a more uniform omnidirectional pattern as well. One can be made for almost nothing, numerous instructions all over the web, purchased for not much more. If you are handy with plumbing and/or machine tools there are better options like the vertical sleeve dipole (below) which can be designed to give very broad coverage of the VHF air band in addition to above-unity gain. I also threw in a photo of a higher grade, broad band ground plane than can be made if you have access to a machine shop.
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Feed Purveyor:
KJFK ARINC
KHPN ATIS
(KJFK) NY DEP Liberty East
HF CAR-A  3455/5550/6577/8846/11396
HF ARINC LDOC  6640/8933
HF NY VOLMET  6604

Complaints should be addressed to: City Hall
JohnN
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« Reply #102 on: December 07, 2013, 12:22:15 AM »

I just remembered that I need to be able to pick up UHF, as well as VHF. Part of the feed is UHF mil-air communications from McGuire/Lakehurst. I guess my ideal solution would be to use the antenna that is up there for ZNY/KWRI/KNEL (with the amplifier and a 2 way splitter) and get a second antenna for the CTAFs. I think I need the amplifier to get the ground side, but the CTAFs should be fine without the amp.
On a side note, does anyone know how to check why a feed is down when it's running on a Raspberry Pi? My feed's been down for about 20 minutes, but I don't have a clue how to fix it. Hopefully it will just fix itself by tomorrow.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
RonR
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« Reply #103 on: December 07, 2013, 10:05:27 AM »

Hi John,

My feeds all run off of Pi's. They occasionally go down from time to time and all I do is power off the Pi, wait a few seconds and power it up again. That usually gets it back up. I have two Pi's bere at home and each Pi supports two feeds. I have seen it where one of the feeds  goes down while the other feed on the same Pi stays up. Not sure why that happens. Just power down and power up your Pi, that should fix it.

Sent from my Galaxy S4 using tapatalk
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Feed Provider:
ZBW/ZNY/ZDC (JFK Area) #1
ZBW/ZNY/ZDC (JFK Area) #2
ZBW/ZNY/ZDC (JFK Area) #3
ZBW/ZNY/ZDC (JFK Area) #4
ZBW Boston Center (CLIPR32/HTO31)
ZBW Boston Center (DXR19/SOUTHIE49)
JohnN
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« Reply #104 on: December 07, 2013, 11:16:13 AM »

Yeah, the power cycle did it. I think mine went offline from a power glitch last night. The lights flashed, and that must have been enough to knock the Pi offline.
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Feed Provider:
KBLM, 3N6, N12
KWRI, KNEL, ZNY
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