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Spectra Worth Fixing
Posted: Sun Dec 23, 2007 10:38 am
by KitN1MCC
i have a 100 watt VHF with possible bad amp/caps should i fix it or just pick up a new unit,
Re: Spectra Worth Fixing
Posted: Sun Dec 23, 2007 12:45 pm
by dbfd588
caps would be way cheaper. if its caps. if the amp is bad you should be able to pick one up cheaper than you could buy another one. Is the display going bad or what?
Re: Spectra Worth Fixing
Posted: Mon Dec 24, 2007 10:53 am
by motorola_otaku
By "amp", I assume you mean the PA board. What's the part number? I may have a clean spare I can part with.
Re: Spectra Worth Fixing
Posted: Mon Dec 24, 2007 4:15 pm
by jackhackett
Could also mean the audio amp, which is probably more likely if he's asking about it in conjunction with the caps.
KitN1MCC, what symptoms are you seeing?
Re: Spectra Worth Fixing
Posted: Mon Dec 24, 2007 7:21 pm
by KitN1MCC
no power out of the transmitter. i can have bob KCbobo do the caps but i think it may be more than that
Re: Spectra Worth Fixing
Posted: Tue Dec 25, 2007 12:55 am
by Will
KitN1MCC wrote:no power out of the transmitter. i can have bob KCbobo do the caps but i think it may be more than that
You are correct, way "more than that"
Re: Spectra Worth Fixing
Posted: Tue Dec 25, 2007 7:51 am
by KitN1MCC
any one on here want to fix it heheheheh
Re: Spectra Worth Fixing
Posted: Wed Dec 26, 2007 1:25 am
by Will
KitN1MCC wrote:any one on here want to fix it heheheheh
Sure, I will be glad to "fix" it for you.
Re: Spectra Worth Fixing
Posted: Wed Dec 26, 2007 6:22 pm
by KitN1MCC
send me a pm with the info.. i know bob here local can do the caps but i think he needs more. and my freind carl local is way busy and does not have the stuff to do the spectra
Re: Spectra Worth Fixing
Posted: Mon Dec 31, 2007 4:09 pm
by kc7gr
Actually, the problem may not be as bad as it sounds.
One failure I've seen with Spectras, particularly the high-power radios, is that one or more of the PIN diodes in the PA section will short out. This can cause greatly-reduced receiver sensitivity or... drumroll... reduced TX power.
There's a simple test you can do. Hook the radio up to a bench power supply that has current metering, hitch the antenna port to your favorite dummy load or service monitor, and key up. If the radio's drawing heavy current (10 or more amps), but no power's coming out, there's a good chance that it's either the PIN diode(s) or a broken center pin in the antenna connector.
If the current drain is less than 10 amps, you do indeed have other problems.
Happy tweaking.