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Author Topic: NC303 Band switch  (Read 1735 times)
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Detroit47
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« on: January 20, 2020, 01:04:00 PM »

Any thoughts on cleaning a cruddy band switch? My NC303 has been gone thru and plays nice. With the exception of the band switch. On some bands I have to rock and fiddle with it to make contact. I have used all the miracle stuff Deoxit contact cleaner etc. The only thing that seemed to work was what I call the nuclear option. I am sure you gotta remember Tarn X from later night TV. This stuff takes anything off but it isn't gentle and then you have to get it off. Thoughts comments.

73 Johnathan N8QPC
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Jim, W5JO
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« Reply #1 on: January 20, 2020, 05:34:59 PM »

De-Ox-Id
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Detroit47
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« Reply #2 on: January 20, 2020, 06:29:03 PM »

My mistake I didn't know there was two products with such similar names. Deoxit and DE-OX-ID
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nq5t
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« Reply #3 on: January 20, 2020, 08:50:21 PM »

Deoxit — Caig Labs
Deoxid — GC Electronics.
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k7mdo
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« Reply #4 on: January 20, 2020, 11:23:46 PM »

My 303 exhibits the connection intermittentcy on the band switch.  DE OXIT helped but I used it pretty sparingly.

AM audio improves by riding the RF gain and AF gain much like tuning SSB.  Also the speaker callout is for a 4 ohm speaker but it seems to me the audio quality improves with an 8 ohm speaker. Oddly the 300's callout 8 ohm while the 303 manual states 4 ohm!?

I do remember a MOD in the audio section done a few years ago, you might try a search on National MODS.

73 K7MDO

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