After dealing with everything from the "waterproof" muffled TX audio, to the "square wave" PL encoder that no receiver can filter out, my VX-7R revealed yet another Yaesu factory design flaw, relating to the misuse of ceramic filters in their IF stages. It went deaf on all bands until you bypass the narrow band ceramic IF filter by switching the receiver into the wide band FM mode.
It is important to understand this is not the result of some defective part that Yaesu inadvertently used. It is the direct result of Yaesu engineers completely ignoring the manufacturers datasheet for the ceramic filter, where it indicates the filter cannot have DC applied to it and must be used with DC blocking caps.
No one at Yaesu cares anymore. They know there is only 2.7 volts DC applied to the ceramic filter and that is not enough to short the filter before the warranty expires! I now call Yaesu "Three in one" because this is the second Yaesu I've purchased new, where they have managed to squeeze three significant design flaws into a single product!
It is important to understand this is not the result of some defective part that Yaesu inadvertently used. It is the direct result of Yaesu engineers completely ignoring the manufacturers datasheet for the ceramic filter, where it indicates the filter cannot have DC applied to it and must be used with DC blocking caps.
No one at Yaesu cares anymore. They know there is only 2.7 volts DC applied to the ceramic filter and that is not enough to short the filter before the warranty expires! I now call Yaesu "Three in one" because this is the second Yaesu I've purchased new, where they have managed to squeeze three significant design flaws into a single product!