MFJ-259 B technical information

[F8VOA]

Good morning ,

My name is Marc ( F8VOA - all details on QRZ.com ) and I'm new on this forum .where I hope to find some usefull information.
I'm searching technical information concerning the MFJ-259 B . MFJ enterprices is very helpfull with general information and diagrams but not with specific technical information . I received a MFJ-259 B without case , screws .... only the circuit boards and the meters ( I build the rest ) Problem is no oscillation . I cleaned the switch and did some tests on Q1 and Q2 - Q1 : Drain 5.6V(SWR mode ) - 6.13V (SLP) / Source 1.9V-6.12V / G 0V-0V ....Q2 D 5.6V-6.13V / S 1.9V-6.12V / G 0V-0V . Do someone had the same problem ( no oscillation ) or have someone the good values (V) on this Fet's .
All help will be very appreciated .

Best 73

Marc

 

[Quiksilver]

Not being disrespectful, but why would you buy a 259B (if you can still call it that) in that condition. Am I missing something here... :blink:

 

[linearone]

Not being disrespectful, but why would you buy a 259B (if you can still call it that) in that condition. Am I missing something here... :blink:

1) He didn't say he bought it but received it. This usually is how most folks get involved in basket case projects like this.

2) He lives in ESPERAZA, France so perhaps the thought of repairing one instead of buying new and getting hit with shipping and customs etc is attractive.

Hope the project works out for you!

 

[wile2u]

check the quad op amp, don't remember the exact ic part number but that what was wrong with my mfj-259.

 

[K9ZMD]

If there was just one person who could understand and appreciate what you are trying to do, that would be Tom Rauch, W8JI. He wrote the book on the MFJ 259B. For contact info, enter his call sign in the "lookup" box above.