Try to compare the 14VDC voltage on the power supply and the voltage inside the TS440. It is possible that the difference appears due to a voltage drop on the power cable or on the connector contacts. I had a similar problem and I solved it by soldering the DC cable inside the TS440 and now it is permanently attached without being removable.
This was exactly the problem! There were actually a couple of things - one of the fuse holders on the power cable was a bit corroded, so I removed it, and then I also compressed the pins in the HF6 connector so they would make better contact on the radio side, and then I cleaned the pins on the radio side with some deoxit.
Try to compare the 14VDC voltage on the power supply and the voltage inside the TS440. It is possible that the difference appears due to a voltage drop on the power cable or on the connector contacts. I had a similar problem and I solved it by soldering the DC cable inside the TS440 and now it is permanently attached without being removable.
This was exactly the problem! There were actually a couple of things - one of the fuse holders on the power cable was a bit corroded, so I removed it, and then I also compressed the pins in the HF6 connector so they would make better contact on the radio side, and then I cleaned the pins on the radio side with some deoxit.
looking for a backup service monitor. how does the marconi compare to the hp 8921a?
Great video! de W2CSI