J25 was added for external reset switch. Do you still want on board sw?\r
Status: HEADER PROVIDED RGB 09/15/14\r
\r
-28. [X] 1nF to filter noise across 500k R42 but very close to op-amp.\r
+28. [ ] 100pF to filter noise across 500k R42 but very close to op-amp.\r
Status: Added. Correct placement? RGB 9/8/14.\r
+ 4 Oct 2014; DGR Changed from 1nF to 100pF after testing with dynamic\r
+ microphone by Michael Wlid\r
\r
29. [O] highly senstive net between R53 and R42 should be shorter if possible, \r
as we are getting a lot of noise pick up.\r
SignaLink cable will bring whatever is at the Rig Digital connector to the SM1000\r
Status: Implemented parallel configuration RGB 09/27/14\r
\r
-63. [O] U3 (USB chip) is hot to touch, in normal operation and USB boot mode. \r
+63. [X] U3 (USB chip) is hot to touch, in normal operation and USB boot mode. \r
+ same chip isn't hot on Discovery\r
+ suspect this is a "David error" - e.g. wrong resistors loaded,\r
pot is also glued to PCB nearby which may be shorting and USB\r
connector has become detached once so there may be a short.\r
Status: Open. Needs debug. RGB 09/27/14\r
- \r
+ 4 Oct 2014: Michasel Wild doesn't report this issue, have concluded it a one off error on Davids board\r
+ \r
64. [O] Found soldering little wires to the RJ45 patch panel unwieldy. Is there a better way? Also should we separate the grounds for mic/spkr/ptt to rig? mic grounds often separate on rig connectors.\r
Status: could use thru hole part,but would require hand soldering - extra mfg operation RGB 09/27/14\r
\r
[X] load C55 & C56, both 1nF, reduced switcher noise\r
[X] add 100nF across R40, also reduced switcher noise\r
[X] add 100uF 6.3V electrolytic (or tant) across R40, this reduced 50Hz frame rate noise\r
+ [ ] 100nF across R45\r
[ ] Microphone bypass network:\r
- [X] Add 100 ohm R in net between J3/R39\r
- [X] Change C32 to 100uF 6.3V electrolytic (or tant) and move to junction of 100 ohm/R39 to AVSS\r
- [X] add 100nF across 100uF C32\r
- Status: A lot of new parts!\r
+ [ ] Insert new 100 ohm R in net between J3/R39 (keep 2.2k)\r
+ [ ] Change C32 to 100uF 6.3V electrolytic (or tant) and move to junction of 100 ohm/R39 to AVSS\r
+ [ ] add 100nF across 100uF C32\r
\r
+ J3 - 100 ohm - 2200 ohm \r
+ |\r
+ 100nF parallel with 100 uF\r
+ |\r
+\r
+ Status: A lot of new parts!\r
+ \r
66. [X] Change R48 to 10k, makes level adjustment on FT817 easier. TBC on further radio testing.\r
Status: Changed RGB 09/27/14\r
\r