How long should the jumpers between my radio and amp be? Also between my amp and switch box? I'm getting a squeal at times and i beleive i heard that the jumper should be 6 feet each. i hav 3 foot jumpers.
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Jumper wire
- Thread starter fisjr
- Start date
well i use 3 feet jumpers
but always been told use shortest lenth to go from
point a to poiunt b
i highly doubt your jumper lenth is causing the squeal BUT
a bad jumper might
but always been told use shortest lenth to go from
point a to poiunt b
i highly doubt your jumper lenth is causing the squeal BUT
a bad jumper might
Borrow a dummy load that can handle the watts from your amp.
Try it instead of your antenna.
If you still have squealing, then probably you have a bad coax shield connection.
But if you dont have squealing any more with dummy, then you likely need a few ground straps on your car chassis. they call it "bonding". It makes your antenna happy.
You can "hear" almost anything about 'jumper', or feed line lengths. That certainly doesn't mean that what you 'hear' is valid. If the thing on one end of that jumper or feed line is the same impedance as the jumper/feed line, and if the thing on the other end of that jumper/feed line is also of the same impedance, the length of that jumper/feed line makes no difference at all.
The length of a jumper/feed line has very little to do with any 'squealing' that you may hear. The amount of shielding of that jumper/feed line can -possibly- have something to do with that, but that's not a given by any means.
A dummy load is a very handy tool to have around! Unfortunately, it will only provide a typical 50 ohm resistive load on the end of a feed line. It can certainly eliminate the antenna as a possible source of that 'squeal', but only if that antenna IS the source of that squealing. There are some "but's" in that though! One of those "but's" is that the dummy load isn't providing as much radiation to cause that 'squeal' as the antenna, dummy loads DO radiate.
Unhappily, the most likely source of a 'squeal' is the device producing the RF, which in most cases is the radio (or amplifier if any). Make sure it isn't the culprit first. A 'leaky' feed line is also a possible source, check it too (and anything IN that feed line). And the antenna is also a source, as in maybe too close?
This stuff is Soooo much fun, ain't it?
- 'Doc
The length of a jumper/feed line has very little to do with any 'squealing' that you may hear. The amount of shielding of that jumper/feed line can -possibly- have something to do with that, but that's not a given by any means.
A dummy load is a very handy tool to have around! Unfortunately, it will only provide a typical 50 ohm resistive load on the end of a feed line. It can certainly eliminate the antenna as a possible source of that 'squeal', but only if that antenna IS the source of that squealing. There are some "but's" in that though! One of those "but's" is that the dummy load isn't providing as much radiation to cause that 'squeal' as the antenna, dummy loads DO radiate.
Unhappily, the most likely source of a 'squeal' is the device producing the RF, which in most cases is the radio (or amplifier if any). Make sure it isn't the culprit first. A 'leaky' feed line is also a possible source, check it too (and anything IN that feed line). And the antenna is also a source, as in maybe too close?
This stuff is Soooo much fun, ain't it?
- 'Doc
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