Re: Looking for 067-0625-00 Peak-to-Peak Detector Photos
Hello Jaredtoggle quoted messageShow quoted text
I’m sorry but I can’t remember all of the details from when I took the cavity apart – should have taken more photos. I’ve just taken the covers off and had another look at the PCB, but don’t really want to take the cavity apart again as I think it was awkward to reassemble properly. The 100 ohm resistors are soldered to C1 and C2 (fixed to the cavity wall) inside the cavity. I don’t think the 50 ohm resistor has any capacitor connection inside the cavity, although it is of course connected to c3 and c4 on the PCB.
From: <TekScopes@groups.io> on behalf of "Jared Cabot via groups.io" <firstname.lastname@example.org>
Reply to: <TekScopes@groups.io>
Date: Saturday, 13 February 2021 at 2:14 am
Subject: Re: [TekScopes] Looking for 067-0625-00 Peak-to-Peak Detector Photos
Do you remember how the signal passed through from the cavity to the PCB?
It appears there is a feed-through capacitor for each diode maybe? Do you remember if the 50ohm resistor had this too or if it was just passing through a simple hole?
On Fri, Feb 12, 2021 at 12:00 PM, Kerry Burns wrote:
As far as I can remember it was fairly simple – as per the third photo in
the album (the one with the red tape). The 50ohm resistor is soldered directly
to the centre pin of the GR-874 and the two diodes to the ground. Despite
the warnings in the manual about disturbing this RF cavity, my peak detector
seemed to test ok after the repair. I had no choice anyway as the 50 ohm
resistor was broken in half. I was just careful to select the new resistor
to measure as close as possible to the correct value.