Hello, Share your involvement and inspirations with your DC40 Kit operations. Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73 51 years...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the dc40kits group. File :...
dc40kits@yahoogroups....
Mar 11, 2006 3:57 am
4
DC40 Folks, PDF Voltage Chart for the DC40 uploaded to the Files section. Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73 51 years -|-...
I hate it when this happens, but it does. It is part of the process. Ok here we go. 1. Make sure that pin 9 of U2 is grounded. The best way is to run a ...
DC40 Folks, [ Note: This message was previously posted to QRP-L, QRPp-I and QRP-Tech ] With my particular set of parts, the oscillator didn't work when I did...
Just catching up on the group admin stuff. Here's the message approved new members will be receiving. And the one those already signed up should have...
My DC40 works great on transmit, But the rcvr sigs are very, very weak.Audio section OK sidetone volume good. I took some voltage readings on U2, something...
George, Your voltages compare closely to those I posted to the Files section. The voltage on pins 10/11 will be ambiguous with a voltmeter. These are RF Osc ...
In a message dated 3/11/2006 13:08:24 Eastern Standard Time, w5usj@... writes: Well I am using same headphones I use with rockmite. Tried 2 other ones...
I also had weak audio in my unit. The oscillator wouldn't run initially. I modeled it in spice and it didn't work there either. After many changes, I ...
I too would like to know what you did too increase audio.... RC kc5wa ... -- No virus found in this outgoing message. Checked by AVG Free Edition. Version:...
Morris, For those of us less technical, can you give us more details about which pins are involved on which chip and the signal levels we should find? Also,...
Just to show you that the little DC40 from Hendricks QRP Kits really works, I just worked a station next door to Chicago from central California with mine....
Guys, just want to take a moment to say welcome to the list and update you on some things that will be happening in the future. First of all, I will be...
Just wondering if anyone who has built both kits can compare their receivers for the group. Alternately, I'm wondering how the DC40 compares to other popular...
... say for ... The mixer is a chopper with an analog switch (or mux if you will). the select line is used to select either the Plus or Minus signal from the...
Morris, I don't understand this. What do I need to do to increase the waveform. Thanks for your reply George The mixer is a chopper with an analog switch...
I tried three sets of headphones and my iPod ones seem to give the most volume, but it is too quiet in my opinion, even when in the passband. -Dan, AB9ME ... ...
Using the Elecraft SG-1 and a switched attenuator, did a quick check of audio voltage across 15 Ohm earphones (30 Ohms each side). Attenuator steps, 0, 3 and...
That's quite a difference. I wonder if changing some of the R and C values for the audio amplifier stages could get us some more gain, or maybe they're already...
I really think the DC40 audio amp is OK. The sidetone is loud and if I touch some of the pins on audio IC the hum is quite loud. I think the problem is in the...
I wonder if using a socket is the problem with the mixer IC. I didn't feel like soldering direct to the board and they *didn't* supply a socket for this chip...
In a message dated 3/16/2006 09:26:03 Eastern Standard Time, pooba53@... writes: I wonder if using a socket is the problem with the mixer IC. I didn't ...
Friends, Whether you do Chuck Carpenter's VXO modification or not, it's handy to know your transmitter offset. If you have DigiPan on your computer it's very...
Hi, I'm new here so I hope I am doing this right. A couple of weeks ago I received in the mail (2)chip sockets an a little red torriod. what are they for?...
Dewey, Those are parts that were missing from the initial shipment of kits. You may also want to download the latest version of the manual from Doug's ...
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