After reading Defporn's list of modifications to my 949, I decided to go for it and do the receive and noise blanker mods... (Below)
Receive Improvement - D30 & D31
The stock AM Detection diodes are 1N60P devices. These are adequate but can be greatly improved by replacing them with the ECG583 Schottky devices. The replacement diodes allow greater copy of distant stations without allowing your local buddies to overdrive your radio. I have obtained a gain increase of approximately 3db on stations more than 20 Miles away. This modification is especially noticeable in mobile installations where you are forced to use an inferior antenna system (as compared to a base station setup).
Noise Blanker Improvement - D1 & D2
The Noise Blanker diodes can also be replaced with the ECG583 Schottky devices. The improvement over the stock diodes can be rather dramatic, depending on how noisy the environment is around the operating location. Again, this modification is most noticeable in radios being used in mobile installations.
I have the diodes on order from DigiKey... (A whopping $4.88 including shipping!)
I have also seen on other threads that these mods are tied together with swapping out the receive gain transistors (as Carl points does in this thread: viewtopic.php?t=8493).
However, I have also seen threads on other forums that caution that after these mods, a lot of radios will suffer from bleed-over...
I didn't plan on changing out the transistors because I don't want to have any bleed-over; I was only planning on swapping the diodes to improve the noise filtering...
So who all has done this mod and what kind of results did you get??? For the "cents" per diode difference, if this mod gives an improvement, why wouldn't Galaxy change the diode spec? (in other words, Galaxy probably has a reason for NOT using these particular diodes... What is it?)
Thanks for the input!!!