- 1. Topband: YCCC 9 Circle preamp failure (score: 1)
- Author: VE6WZ_Steve <ve6wz@shaw.ca>
- Date: Fri, 13 Sep 2019 12:55:20 -0600
- After 2.5 years of flawless operation, earlier this summer my YCCC 9 circle rx array started to develop some strange inter-mod noise, and random junk showed up on 160m when using the array. I isolate
- /archives//html/Topband/2019-09/msg00065.html (8,108 bytes)
- 2. Re: Topband: YCCC 9 Circle preamp failure (score: 1)
- Author: "Paul Christensen" <w9ac@arrl.net>
- Date: Fri, 13 Sep 2019 15:41:35 -0400
- Steve, I recently ran into an identical problem with an Alpha 89 amplifier. A pair of 0.01 uF/100V caps had failed on the plate choke clapper arm relay. The caps are used on the relay coil as an RF b
- /archives//html/Topband/2019-09/msg00066.html (9,018 bytes)
- 3. Re: Topband: YCCC 9 Circle preamp failure (score: 1)
- Author: lloydberg@charter.net
- Date: Fri, 13 Sep 2019 16:03:41 -0500
- I'm running the YCCC RX array. I had to add 100K carbon resistors between the input terminal and ground as a static drain or the input caps would puncture and burn out the Integrated Circuit. 73 Lloy
- /archives//html/Topband/2019-09/msg00068.html (8,829 bytes)
- 4. Re: Topband: YCCC 9 Circle preamp failure (score: 1)
- Author: VE6WZ Steve <ve6wz@shaw.ca>
- Date: Fri, 13 Sep 2019 15:37:19 -0600 (MDT)
- Paul is absolutely correct. The op-amp is a configured as non-inverting. I incorrectly assumed it was wired to invert simply because all of the pre-amps show the same 180 phase shift. Steve From Babc
- /archives//html/Topband/2019-09/msg00070.html (10,522 bytes)
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