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Old March 19th 04, 01:38 AM
Jim
 
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Default Leader 2M antenna tuner

Hi: Need alignment instructions for a Leader Instruments LAC-897 2M. Antenna
Coupler form the 1970's(?) . Have an owners manual, but no alignment
instructions,
Thanks,

Jim
WA8SDF

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Old March 19th 04, 04:57 AM
Dale Parfitt
 
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"Jim" wrote in message
...
Hi: Need alignment instructions for a Leader Instruments LAC-897 2M.

Antenna
Coupler form the 1970's(?) . Have an owners manual, but no alignment
instructions,
Thanks,

Jim
WA8SDF

No clue there except that an antenna tuner for 2M is usually a very poor
idea as line loss from elevated VSWR can make the system very inefficient,
even though the rig is matched to the line.

Dale W4OP


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Old March 19th 04, 02:00 PM
Tuuk
 
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Hi Dale
Are there any websites or information available to explain more detailed
about using antenna tuners for 2m ? I use two, one for 2m and one for
156megs frequently.

The antenna tuner does bring the reflected power down to almost 0 to the
radio and improves communications both receive and transmit. Could there be
a hidden damage or danger?

Thanks





"Dale Parfitt" wrote in message
...

"Jim" wrote in message
...
Hi: Need alignment instructions for a Leader Instruments LAC-897 2M.

Antenna
Coupler form the 1970's(?) . Have an owners manual, but no alignment
instructions,
Thanks,

Jim
WA8SDF

No clue there except that an antenna tuner for 2M is usually a very poor
idea as line loss from elevated VSWR can make the system very inefficient,
even though the rig is matched to the line.

Dale W4OP




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Old March 19th 04, 02:37 PM
Dale Parfitt
 
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" Tuuk" wrote in message
...
Hi Dale
Are there any websites or information available to explain more detailed
about using antenna tuners for 2m ? I use two, one for 2m and one for
156megs frequently.

The antenna tuner does bring the reflected power down to almost 0 to the
radio and improves communications both receive and transmit. Could there

be
a hidden damage or danger?

Thanks

Hi,

There is no hidden danger. Remember though that a coaxial cable's loss is a
sum of its loss when matched ( 1:1) plus an additional loss caused by VSWR
on the line.
1. A tuner at the rig does nothing to alter the VSWR on the coaxial cable
2. at HF, where line loss is already low and most times insignificant, the
increased loss caused by the VSWR is tolerable- thus thier popularity
3. At VHF the matched line loss ( the mfg specs) may become appreciable
unless large diameter cable or short runs are employed- this is where the
additional loss on the line caused by VSWR (unchanged by a tuner) can add
up quickly

The ARRL Antenna Handbook and probably the Handbook itself has a graph that
shows the additonal loss caused by VSWR on the cable as a function of
matched cable loss.


Dale W4OP


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Old March 19th 04, 04:36 PM
Scott Dorsey
 
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Tuuk wrote:
Are there any websites or information available to explain more detailed
about using antenna tuners for 2m ? I use two, one for 2m and one for
156megs frequently.

The antenna tuner does bring the reflected power down to almost 0 to the
radio and improves communications both receive and transmit. Could there be
a hidden damage or danger?


No damage or danger. But why not just fix the antenna? Making the antenna
present a proper load in the first place will give you much better results
than trying to fudge around a bad antenna with a tuner.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."


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Old March 19th 04, 05:49 PM
Reg Edwards
 
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The antenna tuner does bring the reflected power down to almost 0.

No it doesn't. It only brings the reading on the meter down to almost 0.
Do you really believe it?


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Old March 20th 04, 05:58 AM
Jim
 
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Uh... So I take it nobody has information on how to align a LAC-897?

From: Jim
Organization: Road Runner High Speed Online http://www.rr.com
Newsgroups: rec.radio.amateur.boatanchors
Date: Fri, 19 Mar 2004 00:38:17 GMT
Subject: Leader 2M antenna tuner

Hi: Need alignment instructions for a Leader Instruments LAC-897 2M. Antenna
Coupler form the 1970's(?) . Have an owners manual, but no alignment
instructions,
Thanks,

Jim
WA8SDF


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Old March 20th 04, 07:34 AM
Brian Goldsmith
 
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"Jim" wrote

Uh... So I take it nobody has information on how to align a LAC-897?

***** Why don't you tell us what exactly is wrong with the unit?

Brian Goldsmith.


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Old March 24th 04, 04:22 AM
Jim
 
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Default

The problem is that I that the power output meter isn't giving me accurate
power out readings - it's reading too high. It has a bunch of trimmers in
it, and I don't want to make wholesale changes without the correct
instructions. I verified the swr with another bridge, it seems accurate
enough. have a shop manual for it?


From: "Brian Goldsmith"
Organization: BigPond Internet Services
Newsgroups: rec.radio.amateur.boatanchors
Date: Sat, 20 Mar 2004 06:34:15 GMT
Subject: Leader 2M antenna tuner


"Jim" wrote

Uh... So I take it nobody has information on how to align a LAC-897?

***** Why don't you tell us what exactly is wrong with the unit?

Brian Goldsmith.





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