UBITX Assemly Wiki Page #ubitx
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Hey Bo, According to all drawings and the HFSignals wireup page:
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david todd <kg9rb@...>
Sent from Yahoo Mail. Get the app
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On Sun, 5/13/18, W7PEA <patrick@deepplaya.com> wrote:
Subject: Re: [BITX20] UBITX Assemly Wiki Page #ubitx To: BITX20@groups.io Date: Sunday, May 13, 2018, 8:35 PM I updated the Assembly page with pictures, no making fun of my soldering. ;-) I could use help with two things as I did not do a vanilla installation of these two. 1. The microphone 2. The Keyer If you did a no-modification build, please snap some pics and post them or send them to me and I'll do it. Thanks! W7PEA
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ajparent1/KB1GMX <kb1gmx@...>
One small point.
If your using diode for reverse polarity protection it is better to place the fuses BEFORE the diode as then the fuse blows and the diode is less likely to be fried and also down stream circuits. Allison
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Jerry Gaffke
A search for 'reverse polarity" in this forum shows dozens of hits since the uBitx was released in early Dec.
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Here's a few of mine: https://groups.io/g/BITX20/message/35353 https://groups.io/g/BITX20/message/39877 https://groups.io/g/BITX20/message/44499 I've given up trying to right that particular absurdity. Unfortunately, we have hundreds of new hams with no fuse (or too big of one) assuming they are protected when they are not. And some of them are bound to be a bit too careless as a result. Jerry
On Sun, May 13, 2018 at 07:23 pm, ajparent1/KB1GMX wrote:
One small point.
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K9HZ <bill@...>
There is a really trivial solution to this reversing diode-fuse thing. My drawing is awful but you get the idea… You just need a 50 cent 10A 12V relay.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois
Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook!
Moderator – North American QRO Group at Groups.IO.
email: bill@...
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
A search for 'reverse polarity" in this forum shows dozens of hits since the uBitx was released in early Dec.
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THANKS!
Can you please upload a higher resolution version of the diagram? Also the yellow wire is very hard to see against the white backgrond. Perhaps a darker yellow or a light grey background?
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Thanks David, but I'm looking for pics of the Microphone or the Key jack. This is a vanilla install kids. I'll add a note about adding a fuse in the power line. Or yo know it is a wiki... hint hint. I run my power supply into a RIGrunner 4004U.
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MAX <max@...>
That’s the best one yet.
Regards.
Max K 4 O D S.
I've Never Lost the Wonder.
Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of K9HZ
Sent: Sunday, May 13, 2018 10:39 PM To: BITX20@groups.io Subject: Re: [BITX20] UBITX Assemly Wiki Page #ubitx
There is a really trivial solution to this reversing diode-fuse thing. My drawing is awful but you get the idea… You just need a 50 cent 10A 12V relay.
Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ
Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois
Owner – Operator Villa Grand Piton – J68HZ Soufriere, St. Lucia W.I. Rent it: www.VillaGrandPiton.com Like us on Facebook!
Moderator – North American QRO Group at Groups.IO.
email: bill@...
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
A search for 'reverse polarity" in this forum shows dozens of hits since the uBitx was released in early Dec.
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Very nice documentation.
Does raise a sort loosely related question. If the switch bridging the PA power to the general power is opened, how does the user control PA power. Does it matter if PA power is on all of the time? The PA power could be controlled by using a 2-pole switch, which has other advantages. Thanks, Paul - K2AYZ
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For reverse polarity protection I put a 5 amp rectifier in series from the positive of the power jack and then to both fuses. No relay or extra parts needed. Sure I have a .7 volt drop but I do not think the loss would be noticed to the ear on the receiving end. There is a lot more loss in just changing bands.
-- Lee - N9LO
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R. E. Klaus <reklaus@...>
Back in the 70's, some CB radio manufacturers used a diode in series with the power and it worked well. A couple brands used a bridge rectifier setup in the input power that way it didn't matter which way you connected to power.
Roxie -- K1AUS
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