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Old 10-29-2013, 12:33 PM   #421
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Quote:
Originally Posted by Runn0r View Post
I am an aspiring ham tech. looking to build a custom mobile rig. I ordered a Larsen NMO 2/70B antenna after reading reviews, but I am curious about 1/4 wave antennas as well.

Does anyone have first hand experience testing and comparing a 5/8 wave and a 1/4 wave on 144/440? I know in theory I should have better range with the 5/8 wave but I am contemplating a 1/4 due to weight factors of the thing i'm building.
You can't have a duel band antenna with a 1/4 wave on either band.
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Old 10-29-2013, 12:36 PM   #422
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I know projects can be fun and I don't want to dampen your exuberance, but I fail to see the point of using such a short mast on a mobile install. It's one thing if the mast extends your range by say 20-30 miles, but I would wager that it will probably do almost nothing for you and maybe even make things worse. If it were me I'd just mount that Larsen on the roof and call it good! All mobile installs are a series of compromises and you just have to make the best choices you can given the circumstances.

Now, where masts make a lot of sense is in portable installs. Such as this one:



Portable 2M mast to extend range.[/QUOTE]

Yes. And please note the radials.
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Old 10-29-2013, 04:17 PM   #423
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Quote:
Originally Posted by maineah View Post
You can't have a duel band antenna with a 1/4 wave on either band.

Hmmm I seem to missing something here...

http://www.diamondantenna.net/nr72bnmo.html
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Old 10-29-2013, 06:17 PM   #424
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So, basically the idea of the mast I have in my mind.. would be not to raise the antenna to an advantage elevation, but just to get it above the metal shield of the cab, to that of a roof-mount antenna. The reasoning behind the retractable design... is that I work in a building where I drive under a 7ft ceiling of a parking garage daily. These limitations sparked my mind to build a (cab controllable) retraction-mast design that I have never seen ever.

It's hard to explain now without uploading drawings, but those might (who knows) be proprietary one day. I know this can work, I just need to select the right antenna that can ride..and still perform on this aluminum member I call a mast.

So other than the parking garage, I do like the look of my truck without a permanent antenna. This design will be tactically hidden 2 inches below the bed wall. And this is just another excuse to use a pneumatic system to make something I love even more awesome. Basically.
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Old 10-30-2013, 05:52 AM   #425
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maineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shed
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Quote:
Originally Posted by SoCaltaco65 View Post
Hmmm I seem to missing something here...

http://www.diamondantenna.net/nr72bnmo.html
That is a 1/2 over 1/4 with a matching coil.
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Old 10-31-2013, 06:02 AM   #427
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maineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shedmaineah is one of the sharper tools in the shed
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Quote:
Originally Posted by Spencer View Post
i'm out in Indio on top of Chuckwalla mountain- I wanna test out my new ham radio
can someone jump on
McGilvry
157.545 and say hello? I wanna see the range of my setup
Like to listen to pagers do ya?
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Old 10-31-2013, 08:22 AM   #428
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Had the set screws back out on my NMO Larsen 150B somewhere on a trail in Montana..

Scored a Larsen 2/70C w/ NMO kit for $15 in Bozeman! She basically said, "Well, I don't know what this is, how about $15?"

Werd!

Going to be out in Yellowstone, there should be an IRLP node nearby..
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Old 10-31-2013, 08:35 AM   #429
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Finally came in the mail!!!!!



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Old 10-31-2013, 08:36 AM   #430
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oh nice, someone is going to have fun this weekend.
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Old 10-31-2013, 08:36 AM   #431
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Quote:
Originally Posted by maineah View Post
Like to listen to pagers do ya?
?? Dunno what ya mean
New to this whole thing just installed a rugged race radio on mine and two other friends trucks. So far I've gotten clear calls over 20 miles but wanted to see how it'd work while I was on top of a mountain where someone brighter than myself had installed cell towers. Can't wait to get my cert
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Old 10-31-2013, 09:01 AM   #432
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Rugged radios offers some pretty nice products, especially their 110w radios. Just to bad that the race radios are not FCC type accepted to be on amateur radio bands just to let you know. You'll no what I mean once you start studying for your exam.
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Old 10-31-2013, 11:13 AM   #433
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Quote:
Originally Posted by Chipskip View Post
Finally came in the mail!!!!!


Christmas in October! Let us know when you get it connected up. I'll look for you on aprs.fi.

Quote:
Originally Posted by Spencer View Post
?? Dunno what ya mean
New to this whole thing just installed a rugged race radio on mine and two other friends trucks. So far I've gotten clear calls over 20 miles but wanted to see how it'd work while I was on top of a mountain where someone brighter than myself had installed cell towers. Can't wait to get my cert
Do yourself a favor and call Rugged 888-541-7223. Ask them a simple question. Is is legal to operate (transmit) with your VHF radio without an FCC license? I just did that and I was either lied to (most likely) or the customer service rep was grossly misinformed. He was friendly and polite though.

If you dig a little deeper and obtain Rugged Radios frequency list that they program into their radios, at the top of this list is this little warning:
Content provided is included for the sole purpose of providing educational information on a passive basis. Frequencies shown have been compiled from various sources. It is the end user’s responsibility to observe FCC regulations for proper use and programming of any radio frequency
Please note the passive basis. What does this mean? It means for listening only. They know the limits of the law and when you key up one of your race radios without operating under an itinerant FCC license, it's illegal.

Now I'm going to prove it to you. I give you two exhibits for your examination.

The first is a partial screen capture of Rugged Radios frequency list they program into their radios for sale. Notice the highlighted frequency of 151.925. Exhibit two is an FCC License frequency search by geographic location [CALIFORNIA], and I searched for active licenses. You'll note that there are 44 business that are licensed for that frequency with 1-10 shown.

Exhibit 1 a


Exhibit 2



Take a look a that list. If you used that frequency for example, you could interfere with Hospital operations, or the State of California... Both of which probably has deeper pockets than you and they could file complaints to the FCC which may come after you...The bottom line is that by transmitting with your race radio, your committing an illegal act and you subject yourself to potential financial and legal troubles. Do I write this to make you feel bad about your radio? No. It's to educate you and help protect you from the ignorance and misunderstanding of others.

If it were me, I'd return the race radio and buy a dedicated ham rig and get my amateur license. One of the biggest drawbacks of the Vertex gear is you can't program it yourself. The ham gear is all programmable by the operator.

Quote:
Originally Posted by MonkeyProof View Post
Rugged radios offers some pretty nice products, especially their 110w radios. Just to bad that the race radios are not FCC type accepted to be on amateur radio bands just to let you know. You'll no what I mean once you start studying for your exam.
Nothing wrong with using vertex gear on the amateur bands. Hell, you can use anything or build anything as long as your gear does not QRM anybody and you adhere to power restrictions, etc. As a side note, I want to hear more about Tim's old converted land mobile equipment. How heavy was that Micor?
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Old 10-31-2013, 11:27 AM   #434
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Had no idea about vertex operating on amature bands ..to bad can't program repeater sets into the race radios offered by rugged radio
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Old 11-01-2013, 06:29 AM   #435
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Ok here is the deal the land/mobile radios are type accepted radios they have very tight freq. tolerance many of those radios will work in the amateur bands more often than not they require propriety software to program them (dealers). Some require a complete re-tune because they are numb as a hake out of band (very poor receive). It is legal to modify them to operate on the amateur bands but it is not legal to modify a ham radio for the land/mobile service. Over the years we have used old land/mobile gear for repeater service because they are very rugged and have a much greater duty cycle that the ham gear. There are also a large number of them in service as ham mobile radios most often the more modern ones because they are synthesized and smaller. The old stuff had crystal controlled frequencies and you had to have crystals cut to the freq. expensive and a pain in the back side. This is OK for a repeater because you are only dealing with two frequencies. I still have a Micor operating on a site in Conway NH that I re- built in 96 all 25# of it, it was an old state police mobile unit There is another Motorola base in my shop that is far more modern it is a complete unit with a power supply it tips the scales at close to 200# it will replace the Micor. For you guys transmitting on a licensed band (land/mobile) for fun you are playing with fire if you interfere with the service they were intended for trust me they can find you.
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Old 11-01-2013, 04:08 PM   #436
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Quote:
Originally Posted by maineah View Post
Ok here is the deal the land/mobile radios are type accepted radios they have very tight freq. tolerance many of those radios will work in the amateur bands more often than not they require propriety software to program them (dealers). Some require a complete re-tune because they are numb as a hake out of band (very poor receive). It is legal to modify them to operate on the amateur bands but it is not legal to modify a ham radio for the land/mobile service. Over the years we have used old land/mobile gear for repeater service because they are very rugged and have a much greater duty cycle that the ham gear. There are also a large number of them in service as ham mobile radios most often the more modern ones because they are synthesized and smaller. The old stuff had crystal controlled frequencies and you had to have crystals cut to the freq. expensive and a pain in the back side. This is OK for a repeater because you are only dealing with two frequencies. I still have a Micor operating on a site in Conway NH that I re- built in 96 all 25# of it, it was an old state police mobile unit There is another Motorola base in my shop that is far more modern it is a complete unit with a power supply it tips the scales at close to 200# it will replace the Micor. For you guys transmitting on a licensed band (land/mobile) for fun you are playing with fire if you interfere with the service they were intended for trust me they can find you.
200 lbs! Totally awesome.
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Old 11-01-2013, 04:09 PM   #437
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Check this out... postd on ARRL's site

Quote:
Helping to alleviate concerns that it rarely polices the Citizens Radio Service (CB), the FCC has fined an Alaska CBer $500 for “willfully and repeatedly” operating a non-certificated CB transmitter with an RF linear amplifier which, the Commission said, violated federal law and its rules and “voided his authority to operate his CB station.” In a Forfeiture Order released October 30, the FCC noted that the CBer, Glenn S. Yamada, of Kenai, Alaska, did not deny the violations but stated that he “did not intend to violate” the Communications Act of 1934 or FCC rules. Yamada also told the FCC that he was unable to pay the initial forfeiture of $12,500, imposed in a July 18, 2012, Notice of Apparent Liability for Forfeiture (NAL). The Commission said its agents had identified Yamada as the source of a signal that the Commission’s High Frequency Direction Finding Center “observed interfering with safety of life operations on the frequency of 21.965 MHz [sic]” in January and February 2012.
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Old 11-02-2013, 06:48 AM   #438
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Yep and CB is generally used on AM. What happens the operators all ways think more is better so they add a power mike full gain and a 1.5 KW amp over modulate the AM and cover well over 20 KC's in either direction blissfully thinking that sounds good on the other side but having no concern that they are transmitting all over the place. Big brother is listening and for good reason.
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Old 11-03-2013, 02:26 PM   #439
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Quote:
Originally Posted by maineah View Post
Ok here is the deal the land/mobile radios are type .... interfere with the service they were intended for trust me they can find you.
could you elaborate how they can find you? Please. I am getting ready to start studying for the tech test...I am all about being legal.

Thanks.
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Old 11-03-2013, 02:43 PM   #440
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Quote:
Originally Posted by romafern View Post
could you elaborate how they can find you? Please. I am getting ready to start studying for the tech test...I am all about being legal.

Thanks.
In the old days we'd use directional yagi or loop antennas. We'd go on 'foxhunts' as a hobby.
Now days they have sophisticated dopplescant systems, like on the top of police cars with the four or five short vertical antennas, like the Lojack systems.
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