March 25th 11, 05:24 PM
|
|
Junior Member
|
|
First recorded activity by RadioBanter: Mar 2011
Posts: 7
|
|
Thanks again for the help guys... it turned out to be that trimmer capacitor - C138. When I had opened the radio up, I had unintentionally flipped the AGC switch on, setting it to its minimum setting. That is what killed AM when I put everything back together!
Do you think this will it be a permanent fix, or does this mean the capacitor is on its way out?
Quote:
Originally Posted by
On Mar 24, 8:47*am, "D. Peter Maus" wrote:
On 3/24/11 24:29 , wrote:
On Mar 23, 5:03 am, "D. Peter *wrote:
On 3/22/11 23:18 , bpnjensen wrote:
On Mar 22, 4:14 pm, "D. Peter * *wrote:
* * *Check the antenna select switch, and the DX/Local switch. It
sounds like you have some oxidation in your unit. These switches, if
oxidized, will produce the very symptoms you describe, especially
true if FM is now working.
* * *Throw these switches several times. Move the toggle in a circle
until you get some change in the noise.
* * *I experience this regularly with my own Sat500.
Could you get the same results with a squirt of cleaner in the switch
innards?
* * You could. Wearing through the oxide is a better solution for
serveral reasons. Cleaners tend to dissolve, or at least soften,
existing lubricants within the switch, which can cause them to migrate
into contact areas, attracting dirt, rehardening into films that
interfere with contact. Or worse, creating corrosive elements by
chemical actions between the cleaner, the lubricants, and some airborne
crap. Which necessitates more frequent cleaning of the switch.
Eventually, replacement is required.
* * Cleaning may produce a result, but it often comes at a cost of
shorter switch life.
Real switches have gold plating in the contacts . For real .
* *Indeed they do.
* *And when those get noisy, it's because the base metal substrate
has migrated through the gold and oxidized. In which case
replacement is the only option.
* *At one station I worked, we bought a Harrison Pro 790 console for
the production studio. Tremendous console. But they cheaped out on
the switches.
* *I had to replace them all. Hundreds. They provided them for us.
And they were better switches than had been installed. But WHAT a PITA.- Hide quoted text -
- Show quoted text -
C'est la vie .
|
|