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Install Garage & Help Desk You've got the radio, now which cable goes where? Got questions about factory installed radios in your car? Ask any installation or help questions here and someone will get to you soon.

 
 
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Old 06-21-2003, 12:15 PM   #1
minemapper
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Default Coax antenna cables fixable?

I finished installing my Sirius sat radio system (Panasonic SRF100), and am very proud at managing to wire it up without blowing up the car (my first real audio install in a car). However, it seems that when I ran the antenna wires in through the regular hole in the roof, they got pinched. No signal

Took it apart again and removed the antenna today. I figured you guys might be able to help on this before I break down and order a new antenna from Crutchfield. Would it be possible to cut the wires past the break, and re-solder them into the antenna circuit board? Or does this require a level of equipment and expertise that I just don't have?

This is the antenna I have.
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Old 06-21-2003, 01:24 PM   #2
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This should be fine. Since you will be breaking the shieled cable you may be more prone to interference from things like your car alernator but it will likely make no difference.
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Old 06-22-2003, 05:32 AM   #3
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The coax that SDARS antenna use are not entirely common, so you probably don't possess the equipment needed to repair it. It isn't just coax that you find in RG6 or RG59 cables!

I'd try and see if they will allow you to exchange it first. If the wires aren't entirely cut off, just try and tell them that it is defective.
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Old 06-23-2003, 06:54 PM   #4
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I'd be sure it's really broken and you don't have some other problem. Perhaps plug in another antenna (that you can return) to test. Or open the antenna and ohm out the cable, you can do this by connection a flashlite blub and battery if you don't have a meter.

To answer your question yes you can cut the wire and re solder it. It should not be that difficult.
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Old 06-23-2003, 07:01 PM   #5
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Quote:
Originally Posted by packrat55
I'd be sure it's really broken and you don't have some other problem. Perhaps plug in another antenna (that you can return) to test. Or open the antenna and ohm out the cable, you can do this by connection a flashlite blub and battery if you don't have a meter.

To answer your question yes you can cut the wire and re solder it. It should not be that difficult.
I am missing something but at 2.4Ghz, it might still ohm out ok, and even light a light bulb, but if the conductors are too close or the insulation is damaged, will there not be an impedance mis match causing Standing waves and poor reception? To really check it wouldn't you need an impedance analyzer good to 2.4GHZ (if they make one, I don't know)? Wouln't it be less frustrating to go buy one and return it? Help me out here, I'm lost.
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Old 06-24-2003, 04:36 PM   #6
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Standing wave is really only an issue for an antenna that transmits. Standing wave is a ratio that comes into play causing wattage to be reflected back at a transmitter versus the forward wattage being radiated. Since Sirius is unidirectional (From the sky down) and the Sirius DLP doesn't do any transmitting it wouldn't be an issue. But the theory that an antenna being cut to resonance and that has the correct capacitave / reactive match on the feed line (50ohm or 450ohm feed line for example in amateur transceivers) affects radio reception is sound. The receiver / preamp in the DLP would expect a match even though it has no transmit capability. (Theoretically)

I personally would buy an antenna from a local dealer and try that first. If it doesn't work return it. You may also try e-mailing Terk and requesting a return material authorization for a "non-functional" antenna. An RMA would allow you to ship it back in exchange for a new one if their willing to do so.

The email address is terksupport@terk.com


--DigitalControl
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Old 06-25-2003, 02:47 PM   #7
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Thanks for the responses guys. I have an electrical engineer friend that I'm going to meet tonight. We'll take a stab at fixing it.

If that doesn't work, I'll contact Terk for a replacement.
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