Recently I purchased a used MFJ-259B and although it seemed to be working well I could not get it to power up using an external source. The power was not getting past the DC connector to the rest of the circuit! I looked at the schematic and added a small jumper to connect the center pin of the power jack to the + on the board the same place that the battery power comes in. Yesterday I had tuned the 'Arrow' ant using a Bidirectional RF Wattmeter (old Heath IM-4190) and it seemed to be hearing better especially on UHF. This shows the VHF side with favorable SWR and I can now hear the low orbit sats on both VHF and UHF.
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