| Author |
Message |
    
Jimmy396
Member
Username: Jimmy396
Post Number: 71
Registered: 1-2002
| | Posted on Wednesday, February 09, 2005 - 12:24 am: | 
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Beam before Low Pass filter 1.1 After i put in a MFJ Low Pass filter 1.5 Also i seen after i Put filter in line My 3 /-/-/ Beam was not hearing to well.So tonight i took filter out and iam Back to 1.1.But here's my Question since its to late for DX do you think my Beam will Hear Like it did a week ago .Will the Low Pass filter mess up my RX that much on my Beam.Just want to know befoe i wake up tomorrow .Thanks Jimmy |
The ELCO guy (Unregistered Guest)
Unregistered guest
| | Posted on Wednesday, February 09, 2005 - 8:45 am: |
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Well Jim the first thing that sprang to mind was your statement that 1.5 is high. Hmmm how to procede, lets say you are using 50 ohm coax and you have that SWR of 1.5 showing on your meter placed at the back of the radio. This would mean that your antenna or "antenna system" as a whole measured at the radio has a resistance of 75 ohms (75 / 50). This in itself is not a bad thing in that if you are using any length of coax it (the coax) is adjusting/soaking up some SWR along its length. And that the power loss at 1.5 is soooo small there is nothing to worry about.
Another thing you have to rember is that any antenna, even a perfectly matched antenna, will be tuned to only "one" frequency. The farther away you get from that sweet spot on either side the more the antenna will become out of tune. So if you note a small increase in SWR when you move in frequency away from the point of tune know that it is normal. As long as the ratio is workable dont worry.
Where you put the SWR meter is important in determining the where the SWR is being read. The best place to measure SWR, believe it or not, is at the feedpoint of the antenna itself where you can read the actual SWR where the Coax meets the antenna. Check your SWR there and adjust the antenna to a true 50 ohm feedpoint without coax soaking up SWR along its line.
Well got to run to go to work. I hope I did not confuse you |
Road_warrior
Intermediate Member
Username: Road_warrior
Post Number: 284
Registered: 7-2004
| | Posted on Wednesday, February 09, 2005 - 9:26 am: |
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Make sure your jumper wire is good,
connectors & things./Make sure nothing came apart on your beam./ I just purchased a Low pass
filter from Coppers, i hooked mine directly
to radio using a double male connector./ My SWR
went up only a hair & my recieve did not change./
Check things out, hopefully you will find
problem... Best of luck!
JIM/CENTRAL PA/CEF 375 |
Hotwire
Junior Member
Username: Hotwire
Post Number: 41
Registered: 1-2005
| | Posted on Wednesday, February 09, 2005 - 12:31 pm: |
|
Maybe you have a bad filter? I would try a different filter. Also double check your grounding. Hope I can help. |
