 |
Frequently Asked Questions & HOW TO's |
|
Frequently Asked Questions & HOW TO's |
| Mods to MFJ-1274C or MFJ-1270C for FlexNet 6PACK |
| For all those that
have purchased a MFJ-1274C or MFJ-1270C for the purpose
of running FlexNet's 6PACK type EPROM. As produced, these units are not the same as the previous MFJ-1270B / MFJ-1274B models, as an IC (U40) was added to do memory bank switching. They will not function correctly without the following simple modification: 1) Remove the IC U40. (CD74HCT374E) (Save IC for future use in case you want to use TNC for normal packet activity.) 2) Jumper Pin #16 to PIN#1 of the IC socket. (this grounds pin#16) A small piece of thin solid wire inserted in the socket for U40 will surfice for the jumper. After this modification, it will function as a standard TAPR-2 compatable TNC. (Same modification is needed for NETROM/TheNet EPROMS) 73 John WB2CIK |
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