Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old March 15th 19, 09:23 AM posted to sci.electronics.repair
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Default Which coax is better?

I never remember the numbers, so i will just describe it.

CB and low power ham radios use one type.
TV antennas use the other.

Both coax is about the same diameter and looks alike on the outside.

I have a police scanner. It has an ext. antenna connector on the rear
that is one of those "Motorola jacks" (same as the ant. connectors on
car radios).

I used to use a CB (car type) antenna on my roof, for the scanner. It
used the CB coax with them big connectors on the end. When I moved, that
antenna got left behind.

I recently dug out that scanner again, and have it connected to my
homemade weather radio outside antenna. But this weather antenna has the
TV style coax with F connectors.

I dont yet have an adaptor for F connector to the Motorola jack, but
found one on ebay and am waiting for it to arrive.

My question is whether it matters which coax is used? My weather radio
works fine as it is. I did try the scanner using alligator clips to
connect the antenna and i do get a signal.

I dont know how well that antenna, made specifically for 162.xx mhz will
work on the UHF scanner bands, but I have gotten 155.xx VHF signals
well, even with the alligator clip mess.....



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Old March 15th 19, 09:39 AM posted to sci.electronics.repair
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Posts: 9,601
Default Which coax is better?

On Friday, 15 March 2019 08:24:00 UTC, wrote:
I never remember the numbers, so i will just describe it.

CB and low power ham radios use one type.
TV antennas use the other.

Both coax is about the same diameter and looks alike on the outside.

I have a police scanner. It has an ext. antenna connector on the rear
that is one of those "Motorola jacks" (same as the ant. connectors on
car radios).

I used to use a CB (car type) antenna on my roof, for the scanner. It
used the CB coax with them big connectors on the end. When I moved, that
antenna got left behind.

I recently dug out that scanner again, and have it connected to my
homemade weather radio outside antenna. But this weather antenna has the
TV style coax with F connectors.

I dont yet have an adaptor for F connector to the Motorola jack, but
found one on ebay and am waiting for it to arrive.

My question is whether it matters which coax is used? My weather radio
works fine as it is. I did try the scanner using alligator clips to
connect the antenna and i do get a signal.

I dont know how well that antenna, made specifically for 162.xx mhz will
work on the UHF scanner bands, but I have gotten 155.xx VHF signals
well, even with the alligator clip mess.....


50 & 75 ohm. Each is optimised for its own job. Loss & power handling differ, and there's impedance matching to what you're using. There's also wide variation in frequency response with co-ax, some is only good for baseband. Some is well screened, some less so.


NT
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Old March 15th 19, 10:43 AM posted to sci.electronics.repair
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First recorded activity by DIYBanter: Jan 2016
Posts: 133
Default Which coax is better?

The cable must match the impedances at both ends and these impedances
must be the same.
Personally, I recommend shielded cable (signal+alu shield+ground return).

a √©crit le 15/03/2019 √* 09:23¬*:
I never remember the numbers, so i will just describe it.

CB and low power ham radios use one type.
TV antennas use the other.

Both coax is about the same diameter and looks alike on the outside.

I have a police scanner. It has an ext. antenna connector on the rear
that is one of those "Motorola jacks" (same as the ant. connectors on
car radios).

I used to use a CB (car type) antenna on my roof, for the scanner. It
used the CB coax with them big connectors on the end. When I moved, that
antenna got left behind.

I recently dug out that scanner again, and have it connected to my
homemade weather radio outside antenna. But this weather antenna has the
TV style coax with F connectors.

I dont yet have an adaptor for F connector to the Motorola jack, but
found one on ebay and am waiting for it to arrive.

My question is whether it matters which coax is used? My weather radio
works fine as it is. I did try the scanner using alligator clips to
connect the antenna and i do get a signal.

I dont know how well that antenna, made specifically for 162.xx mhz will
work on the UHF scanner bands, but I have gotten 155.xx VHF signals
well, even with the alligator clip mess.....



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