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Amp coax jumper length
- Thread starter fireman32_14
- Start date
Only odd multiples of a 1/4 wave act as an impedance inverter, 1/4,3/4,
5/4,7/4 etc,
these are exactly what you would use to match a quad to 50 ohm cable or co phase verticals/beams.
the even multiples of a quarter wave are the same as the multiples of a halfwave, therefore repeat impedance.
these are what you would use if you wished to repeat the impedance, ie for "more" accurate remote swr readings or to let the radio see the input of a good amp, i use the term "more" accurate as you have to take into account cable losses too,
B
BOOTY MONSTER
Guest
i concur!
The ONLY stupid question is the question that is not asked?
which brings us to these forums to ask questions and to learn, whether we may be hams or chicken banders , either way!
and just because one hasnt the piece of toilet paper hangin on the wall !
doent place them in the idiot ward ?
yes theres good info in a arrl hand book , but if it was so good then how is it so many are trading information in forums instead of reading a damn book?
as a book only feeds information from one persons point of view! so to encompass all forms of an idea one needs to read all books on a subject just to have a basic understanding ?
and back to the tattered paper on the wall, lots of people have paper on there walls , doesnt mean they know what there talking about, just means that they can recite out of a book ! but can they put words into motion ?
well i've shot off my mouth , and i'll probably get another "private message " from admin , but im used to that
An BTW, a good site for info ;ac6v.com
is a good general information site
"yes theres good info in a arrl hand book , but if it was so good then how is it so many are trading information in forums instead of reading a damn book?"
Cuz they ain't got that book? Or may not understand what they read in that book? Or maybe because they have some kind of 'authority' phobia? Or maybe it's a little difficult to ask a book a question? Or, maybe because the ARRL is just a bunch of them hams and you know how they are, right? Oh well...
- 'Doc
Cuz they ain't got that book? Or may not understand what they read in that book? Or maybe because they have some kind of 'authority' phobia? Or maybe it's a little difficult to ask a book a question? Or, maybe because the ARRL is just a bunch of them hams and you know how they are, right? Oh well...
- 'Doc
i concur!
The ONLY stupid question is the question that is not asked?
which brings us to these forums to ask questions and to learn, whether we may be hams or chicken banders , either way!
and just because one hasnt the piece of toilet paper hangin on the wall !
doent place them in the idiot ward ?
yes theres good info in a arrl hand book , but if it was so good then how is it so many are trading information in forums instead of reading a damn book?
as a book only feeds information from one persons point of view! so to encompass all forms of an idea one needs to read all books on a subject just to have a basic understanding ?
and back to the tattered paper on the wall, lots of people have paper on there walls , doesnt mean they know what there talking about, just means that they can recite out of a book ! but can they put words into motion ?
well i've shot off my mouth , and i'll probably get another "private message " from admin , but im used to that
An BTW, a good site for info ;ac6v.com
is a good general information site
A forum member asked a specific question.
"Where can I find this information"
Would you prrefer I reply "Wait until someone with a piece of tattered paper replies with the information"?
Or direct the member with the question to find the information online, for free, at no cost except spending the time to read?
Ok dont want to stir up any argument but im not a Christmas cb been on radio for years but recently I started using a base tube type amp and was wondering after reading the stuff about your swr reading and 50 ohm load .if I have hooked up 3 different power wat swr meters in line cause I was getting a high reading when I kicked on amp and am totaly tuning and load the amp properly but I have allays cut any jumper or coax in increments of two like two foot jumpers and coax length be same like 16 18 20 foot and so on . What I mean to ask is how do u know tjat amp or what ever is 50 ohm load or does this differ from amp to amp depending on who built the amp .
if the meter is between the amp & antenna it does not matter if you tune the amp correctly or not it won't cause high vswr, that's a CB myth,
when playing with jumper length changes vswr readings its a good indication that you have common mode current on the outside surface of the coax braid,
its best to fix the CMC so you know the vswr reading is the antennas match to the coax
and not the antenna + outside of coax, amp case, jumpers, meter, radio, power cable, psu, mic, ground cables ect in parallel with the load the antenna presents to the coax.antenna,
you will almost always see a little higher vswr readings when you turn on an amplifier because the detector diodes used in vswr meters are not linear in their conduction curve.
when playing with jumper length changes vswr readings its a good indication that you have common mode current on the outside surface of the coax braid,
its best to fix the CMC so you know the vswr reading is the antennas match to the coax
and not the antenna + outside of coax, amp case, jumpers, meter, radio, power cable, psu, mic, ground cables ect in parallel with the load the antenna presents to the coax.antenna,
you will almost always see a little higher vswr readings when you turn on an amplifier because the detector diodes used in vswr meters are not linear in their conduction curve.
Actually he was CORRECT with his statement. Care to enlighten us why you think he was wrong instead of just saying so?
