Continuity at the SO239
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gunner57
- Skipshooter
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- Real Name: Doug
- Antenna: Wilson 1000 roof mnt
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Continuity at the SO239
I was testing out a Uniden Grant XL and found there to be some continuity between the antenna jack and the chassis. It isn't a dead short, but there is a reading on my Ohm meter. I replaced the SO239 with another, and found that there was still continuity. So I tested the SO239 I had just removed and once it was out of the radio, there was no reading between the center and the shielded (threaded portion). I decided to test some of my other radios and I found that some have continuity and some don't. Is this normal?
Galaxy 95t2-X-force TNT 600HD-102"
Uniden Grant XL
Uniden Madison V4
Galaxy 929
Uniden PC76 XLW
Cobra 146 GTL
Cobra 138 XLR
Cobra 29 WX NW
Cobra 25 WX ST
Johnson 4230
Uniden Pro510XL
Uniden Grant XL
Uniden Madison V4
Galaxy 929
Uniden PC76 XLW
Cobra 146 GTL
Cobra 138 XLR
Cobra 29 WX NW
Cobra 25 WX ST
Johnson 4230
Uniden Pro510XL
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MDYoungblood
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Re: Continuity at the SO239
Most radios have a capacitor between the center pin and ground, some have more than one. This is the reason you are seeing continuity.
3's
Greg
3's
Greg
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eyecue
- 4 PILL USER
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Re: Continuity at the SO239
There is a problem checking "in circuit" continuity of the connection because there is a filter consisting of capacitors, coils and resistors in parallel with the ground. in RF terms it is not an issue because the RF out does not see it. With an ohm meter though, it is seen. The resister in that family of radios is a 10K Ohm.
