| Author |
Message |
    
Captian_radio
Junior Member
Username: Captian_radio
Post Number: 23
Registered: 9-2004
| | Posted on Tuesday, May 17, 2005 - 12:51 pm: | 
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Why dont most cb amps have a tuned input? My friend has a 150 watt mobile amp that when in use it shows a very high swr, when off it is back to normal swr.Seems to me that a proper tuned input would clear this up.Do the makers of most cb amps leave this out as a cost saving measure? |
Bruce
Senior Member
Username: Bruce
Post Number: 2616
Registered: 9-2003
| | Posted on Tuesday, May 17, 2005 - 1:16 pm: |
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Why make a good amp if it's ILLEAGAL? |
Crackerjack
Advanced Member
Username: Crackerjack
Post Number: 505
Registered: 7-2004
| | Posted on Tuesday, May 17, 2005 - 2:08 pm: |
|
What is the length of cables from
radio-( ? )-amp-( ? )-antenna |
Funtimebob
Intermediate Member
Username: Funtimebob
Post Number: 156
Registered: 5-2002
| | Posted on Tuesday, May 17, 2005 - 2:51 pm: |
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no such animal as a CB amp. 10 meter ham amp....
illegal for use on CB. Have fun  |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1911
Registered: 12-2001
| | Posted on Tuesday, May 17, 2005 - 7:16 pm: |
|
Forget cb for the moment,if the antenna has an insufficient ground plane,it will exhibit this,if the antenna is not rated for this much wattage,same thing,plus you have to readjust the swr meter for the increased power,more watts means more volts and a higher reading if you do not reset the meter.Bigbob P.S.you know I really get miffed when somebody asks a straight forward question,clouded in ignorance and right away everyone jumps on his soapbox and denounces it,answer his question then get behind your podium,man.Bigbob,again. |
Captian_radio
Junior Member
Username: Captian_radio
Post Number: 24
Registered: 9-2004
| | Posted on Tuesday, May 17, 2005 - 7:51 pm: |
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Hi guys tnx for the answers.Well to set the record straight 1, the antenna is a A99, 2,swr meter has been set,3 i have a SB200 amp that i use on 10 meters with an A 99 about 600 wtts, but my swr does not change much at all with the SB200 on.I checked in side this little we will call it a 10 meter mobile amp and i see not sign of a tuned input anywhere.I have seen this happen before with these (10 meter amps)when turned on it causes the swr to go very high as a result of not having a properly tuned input circut.My original question was why do the people who produce these (10 meter amps) negilect to install a tuned input!? |
Yankee
Advanced Member
Username: Yankee
Post Number: 558
Registered: 7-2003
| | Posted on Wednesday, May 18, 2005 - 1:50 pm: |
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To answer Crackerjack's question, 3 foot jumpers or if need be 6 foot and all coax to the antennas at multipals of nine foot works quite well. Tuned lengths of coax is the answer. All my coax lengths are measured. And with the beam and IMAX-2000 I run 1.1 to 1.3 SWR, regardless of what the frequency is. |
Crackerjack
Advanced Member
Username: Crackerjack
Post Number: 507
Registered: 7-2004
| | Posted on Thursday, May 19, 2005 - 1:10 am: |
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Yankee:
Thanks, I was asking Captain Radio what he was using.
I use 9' multiples and it has worked wonders for me.
Thanks. |
Captian_radio
Junior Member
Username: Captian_radio
Post Number: 25
Registered: 9-2004
| | Posted on Thursday, May 19, 2005 - 8:02 pm: |
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How much coax? Enough to reach from the antenna to the radio , thats what i always use.A man once asked Lincon how long should a mans legs be?he repilied long enough to reach the ground.So coax as much as required to go from ant to radio.The question still stands why dont they put a tuned input in the amps like they do with ham amps Tnx guys Bob CEF 451 |
Tech808
Moderator
Username: Tech808
Post Number: 5794
Registered: 8-2002
| | Posted on Thursday, May 19, 2005 - 10:29 pm: |
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Captian_radio,
Since I am not an amplifier manufacturer or none of the forum members are that I know of, I could not even venture a guess.
Maybe you could contact a few Amp Manufacturer's and get thier answers and let everyone on the forum know the answer. 
AMERITRON
http://www.ameritron.com
116 Willow Rd.
Starkville, MS. 39759
662-323-8211 / Fax: 662-323-6551
Galaxy Radios & Texas Star Units
Consumer Electronics
243 S. Escondido Blvd. #523
Escondido, Ca. 92025
1-760-480-8800
RM ITALY Electronic constructions srl
via IV Novembre 16
40045 Ponte della venturina (BO) - Italy
Phone: 0534/60460
Fax: 0534/60460
Email:rm@rmitaly.com
Just a thought,
Lon
Tech808
CEF808
N9OSN
|
Bigbob
Senior Member
Username: Bigbob
Post Number: 1917
Registered: 12-2001
| | Posted on Friday, May 20, 2005 - 6:40 am: |
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My boomer 400 and my golden eagle 150 and my shooting star and palomars and grey 50+ do,but my hooker 100 does not and it sits in the closet collecting dust.Most I have seen have an L-pad and matching transformers to tune the input to the pills,you're dropping from 50 ohm imp. to about 3 ohms,I would say there is somthing terribly wrong inside as I run various length jumpers and have an swr of 1.23 and my antenna has an swr at it's input of 1.3.Bigbob |
