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extra surface mount component
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This has been reported previously: ?/g/BITX20/topic/smd_cap/4525885 I don't remember any resolution to this issue. Might be worth an email to ? ? hfsigs @ gmail dot com My guess is this is a part to improve performance, but that most of us are running without it. ?Likely safe to continue with checkout while this is sorted out. I assume this part was in the bag, and not some part that got chipped off the board by rough handling during shipment. ?My board had C107 chipped off. Jerry, KE7ER On Sun, Mar 26, 2017 at 03:50 pm, College Professor Simon Thompson wrote:
I cannot find in the topic a reference to the extra surface mount component included in the Bitx40 kit. I know it is in there, but I can't find, and I don't know what the component is for. ? |
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I sent an email off to hfsigs asking about that extra SMD cap. ?The answer: ?I should join the Bitx20 group and my technical queries will be solved. On Sun, Mar 26, 2017 at 04:16 pm, Jerry Gaffke wrote:
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Well there you go! :-)) :-)) Roy, WA0YMH On Mar 27, 2017 9:19 AM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:
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Kitty Jack
Jerry, You got me thinking about C107 so I checked my board. My C107 seems to be chipped off as well. Looks like a bypass cap, should I replace it?On Mon, Mar 27, 2017 at 10:18 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
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Very weird. ?I'd think C107 is a good idea, though not absolutely necessary. ?That node is either audio going from the diode mixer over to the audio amp on receive, or audio from the mike amp into the diode mixer on transmit. ? It's possible that you get better audio quality (better high audio frequency response) without that cap. The newer uBitx also has that same 0.1uF cap. I'm curious if those with the SMD cap included in their bag of parts could measure the spare cap, see if it is 0.1uF. ?Perhaps they think it works best without, but threw in the spare cap in case we disagree. Also curious if Ashhar could clear this mystery up for us. Jerry, KE7ER On Fri, Mar 31, 2017 at 01:51 pm, Kitty Jack wrote:
You got me thinking about C107 so I checked my board. My C107 seems to be chipped off as well. Looks like a bypass cap, should I replace it? ? |
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Kitty Jack
Thanks Jerry.? I'll stick one back on and see if i notice anything different.? Mine was definitely chipped off after original installation.? The board still bears the fractured ends of the smd.? I received no spare smd part, but I did get the spare VFO toroid - at least that's what I think it is. Mike, AK3FOn Fri, Mar 31, 2017 at 5:20 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
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I received my BitX40 two days ago. The box contents (item 16) lists the 1 x 0.1uf smd capacitor. It measures at 88.5nf with my cheap tester. There is also a loose ceramic capacitor with leads (104) in the box which is not in the box contents list. It measures at 72nf. Both are roughly the 0.1 uf value. I thought maybe a choice of two types of capacitors. I don't have a new guess on what they are for. My board has an intact C107. I first thought one might be for the 2nd harmonic suppression (see the "bitx output harmonics" thread. The fix for the harmonic problem is a 100 pf capacitor, not 100 nf, so I don't think it is for that. I'm not far enough along to see if mine has a 2nd harmonic problem. Ed, AE6D |
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y Bit The leaded ceramic disk marked 106 is not a mystery, that's called out in the destructions at ???
The SMD 0.1uF cap is still a mystery. ?There were lots of ripped out C107's for some obscure reason, my best guess is the SMD cap is a replacement C107. ?But would not be a bad idea to put a 0.1uF cap on both ends of the tuning pot wires, one at the pot and one on the raduino. ?The raduino end may be the more critical. Jerry, KE7ER On Sat, Apr 1, 2017 at 06:50 pm, <ae6d@...> wrote:
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Goran VE6GPO