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----- Original Message -----
From: Bob Albert
To: hp_agilent_equipment@...
Sent: Friday, December 21, 2012 6:02 PM
Subject: Re: [hp_agilent_equipment] HP-608A Repair
I am having attenuator problems also, with a Marconi TF1066/4. The attenuator rack, made of plastic, had broken because the generator had been removed from the case carelessly. I repaired it with epoxy and the repair looks very good. The attenuator moves smoothly and works well.
However, the calibration is wrong. The output from the generator is about 10dB less than the attenuator says. The pickup coil is as far into the tube as it will go; any farther and it contacts the coil. There is no means I can see for rotating the pickup coil, so I am puzzled as to why the output is low.
I tried increasing the carrier level, assuming that wasn't calibrated, but even at maximum the output is several dB below the dial reading.
Any ideas? This is a true boat anchor, and is way too big and heavy for what it does. I want to get it working properly so I can see about selling it. It has many great features, and covers from 10 to 470 MHz, AM and FM and so on. And it's a nice looking unit, with two big circular dials with two pretty meters and light blue control knobs.
Bob
Hello Bob,
Have you checked that the valves [ tubes] are in full working order?
If you're getting low output from the oscillator then there's nothing the
attenuator can do to compensate.
73 Ken g8beq
Sorry to the group for the previous mail, I caught send before I was ready.
Happy Christmas to all.
