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Several tools and tips for your KWM2, 30L1 and 51S1 from F6CER. You can download them in PDF format.
De nouveaux articles de F6CER pour vos KWM2, 30L1 et 51S1. A lire et à télécharger en PDF.
- Sur votre KWM2:
(de F6FMT)
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The following are some of the resistors in my KWM2 that had to be replaced eventually after discovering their internal failures or drift in value (all of these looked OK to visual inspection): R-148 820 ohms 2W - The value had drifted up to 1400 ohms. Replaced with 820 ohm 5-7 watt wirewound. )This resistor and a diode was installed in the PA screen circuit as a part of a service bulletin. This resistor heats during transmit.) R4 (68K) and R7 (47K) both 1/2 watt - Both had internal value drift as a result of over heating. Replaced with 1 watt units (caused mushy transmit audio). R175 (4700 ohm) - One day the transmit audio just quit. This resistor had broken down internally, no external evidence, however. R50 (47K 1/2 W) (in the tone osc.) - Signs of aging. Replaced with a 1Wunit (also recommended by Collins mod.) R20 and R47 - Two 68K 2W resistors in parallel - Replaced with 34K 7W(or another 2 68K of higher wattages) - Caused overheating andinstability in VOX. |