| Author |
Message |
    
Cold Feet
| | Posted on Sunday, April 20, 2003 - 12:32 pm: | 
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Hi - I am very new to radio and have a silly question. I always hear people talking about big radios. Do they mean the size of the radio or the sound of the audio?
THANKS
Cold Feet |
Hitech
| | Posted on Sunday, April 20, 2003 - 5:34 pm: |
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It could be how many watts they are running, using a amp. Nick 189WV |
Sodapop
| | Posted on Sunday, April 20, 2003 - 6:46 pm: |
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Big Radio has a few meanings. Around here it refers to the amount of features and what it has for audio. Notice I said audio, not just power. It really is all about the audio. And if you want that, you will more then likly get a 10 meter radio and run it on 11 meters. Though there are some CB type radios that have great audio. Just my two cents, hope it helps you out. |
CM 3885
| | Posted on Monday, April 21, 2003 - 12:11 am: |
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A big radio to me is a radio that has lots of audio, keys up the watts and has lots of features and is pysically big!! Like the RCI 2995, 2990, Galaxy series, yaesu FT 101 series, Kenwood series, |
bruce
| | Posted on Monday, April 21, 2003 - 5:05 am: |
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well here is the antenna to go with the radio.....
http://www.df6na.de/~df6na/img/W5UN_2.JPG
and my little radios
http://www.qrz.com/wa4gch
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Taz
| | Posted on Monday, April 21, 2003 - 9:30 am: |
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Bruce,
I have talked to alot of hams and we all agree that with an antenna like that, by the time the coax is split up to each antenna that there isnt any signal left in the coax, so at that point it wouldnt even be worth it. |
Simon
| | Posted on Monday, April 21, 2003 - 10:05 am: |
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Taz
Actually you are wrong. That antenna is for moonbounce or EME as it is known where evey ounce of signal you can get is needed - both on transmit and receive. That antenna will hear a signal that is lost under noise on any normal size antenna. Now without knowing the specs of those yagis Without digging out my old textbooks its hard to explain how and why they do work - if your interested email off here (clowes@bmi.net) and I'll try to explain. Suffice to say that they work, if each antenna had 13db gain and there were 10 of them you would have approx 39dB gain minus the split losses of around 15db for a total gain of around 24db. So now feed a 100w signal into that to have an ERP (efective radiated power of 4500w give or take a few. No dont forget exactly the same signal increase worked on receive. No I'll be honest some of my figures maybe a little off (been years since Ive worked on a problem like this) but the general theory is correct. |
Tech833
| | Posted on Monday, April 21, 2003 - 11:06 am: |
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Tax,
That would be incorrect. Even if there were only 0.01 watts per antenna, if you multiplied that my 1000 antennas, you would end up with net gain. Naturally there are losses in the power divider, however those losses are more than made up by the log gain.
I just did a job in Salt Lake where we installed a UHF T.V. antenna for a new station. The antenna consisted of 6 inch Heliax split 4 ways to 1 5/8 lines. Then, each of the 1 5/8 lines split to 8 lines of 7/8 inch Heliax which each feeds a panel antenna. Each panel antenna had no less than 4 individual phased elements in it. The total was 32 panels for 128 individual antenna elements, all cable fed. The result? LOTS of gain.
The transmitter was only putting out 50 KW visual, but the net ERP of that station including elevation is 5 MW (Mega Watts). |
Taz
| | Posted on Monday, April 21, 2003 - 12:44 pm: |
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Hey Hey Hey wait a minuite...
Im not wrong, I totally agree with the both of you.
Thats just what hams I know have said. |
bruce
| | Posted on Monday, April 21, 2003 - 2:46 pm: |
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W5UN ant has 30DBD of gain it is 48, 16 elem beams some loss every time you split but i ran 4, 17 elem beams for moon bounce and got 20 DBD of gain now IF you could build this for CB man talk about ERP! |
Midnitexpress
| | Posted on Monday, April 21, 2003 - 2:48 pm: |
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anybody ever own a Yaesu GT 757. What do you think about running them in the CB range. Any problems with it? Just curious |
Tech833
| | Posted on Monday, April 21, 2003 - 10:15 pm: |
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Taz,
You said "I have talked to alot of hams and we all agree that ..." By your use of the word 'WE', it appeared as if you were in agreement with the incorrect information. I'm glad you are not of the same belief that your local hams allegedly are.
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Taz
| | Posted on Tuesday, April 22, 2003 - 12:19 am: |
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we=they |
CM 3885
| | Posted on Wednesday, April 23, 2003 - 5:54 pm: |
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Good grief!!! :-( |
Weakeststation
| | Posted on Wednesday, April 23, 2003 - 7:50 pm: |
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My opinion in laymens turns is a ridio thats sounds real good that it sounds like a big radio..Big radio meaning expensive.... |
Kirk
| | Posted on Tuesday, May 06, 2003 - 10:32 pm: |
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Tech 833...was this a digital install? We're getting ready install our digital along side the NEW NTSC we put in last year. High gain antennas on UHF = $$ savings (as you well know). Power Companies LOVE UHF Stations!! Our new NTSC is a Thales IOT |
jake tyler
| | Posted on Wednesday, May 07, 2003 - 1:27 pm: |
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taz never admits when hes wrong |
bruce
| | Posted on Wednesday, May 07, 2003 - 2:37 pm: |
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Jake your WRONG years ago TAZ told me he THOUGHT he was wrong...... but he wasn't. |
Tech833
| | Posted on Thursday, May 08, 2003 - 11:16 am: |
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Hi Kirk,
No this was a new NTSC on channel 32. HSC network. The idea was to get the NTSC on the air and then get a digital freq. ready too. The main is one of those Superior Broadcast rigs. They will be installing a used Comark IOT for the D. I played around with a Comark IOT during an install near me a couple years ago. You know, I am a firm beleiver in the IOT's now. The efficiency and CPH was impressive. It was only a 100KW visual rig though. We have a bigger one coming up I have to get ready for. |
Kirk
| | Posted on Thursday, May 08, 2003 - 5:10 pm: |
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Tech 833-
Yeah we had a bid from Comark also....but Thales (sp?) came in better. Our NTSC has been trouble free for 1 year now....just had a problem with crowbars at first...but then we worked out the bugs there. And yes...very efficient those IOT's. We run about 3 megawatt (last I knew anyway). Had to get used to the "idea' that Aural was injected into visual. Seemed weird when you go from an old RCA to that new concerpt. lol Sorry to disgres and wack out the original topic fellas. Just nice to meet a fellow TV guy. 73-- |
707
| | Posted on Friday, May 09, 2003 - 9:14 pm: |
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My question is, what kind of "Hams" don't know enough antenna theory to understand how that antenna system works? |
