Quote:
Originally Posted by Ian - G4JQT
Quote:
Originally Posted by Bazz4CQJ
I've been trying to find the explanation why Ian decided to leave the 2N3819 for the BF256 but haven't found anything. Thanks
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I explained it in one of the threads, but can't remember which one now.
The reason I changed the 2N3819 for a BF256 was because after making about 30, I had one or two that gave poor modulation. I tracked this down to insufficient drive to Q2. It seems the performance characteristics of the 2N3819 are quite wide, so some just weren't up to the job. I expect J310s would do but I haven't tried them. |
Thanks for that info Ian; I did look for previous comment, but just couldn't find it. I've just ordered the Spectrum kit, so will be using the 256.
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