I replaced IRF510.

bias current = .100A

Output = 3W at HAAAALLLLLLOOOOOOO.

Current draw .650A at HAAALLLOOO.

Chuck

Digikey is another good source, huge selection, good quality products, small orders welcome, fast shipping, and ridiculously cheap shipping costs if you go first class mail, which usually gets to me in Nebraska in two day, three max.
.

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Thank you "ron van doremalen" for your suggestion?to re-install the sketch. It actually worked. But the tuning with the?potentiometer?is a bit flakey. I suspect a short occurred. It tunes too fast going up and too slow going down. Not like it did originally. But now I have something to work with. And I can try "?Joel Caulkins" suggestion of shorting the red wire. I just looked at the sketch and found "#define CAL_BUTTON (A2)". So it is confirmed that the red wire is for calibration.?

Progress can be made in spite of hatred.

I am glad I didn't take Jack's offer.

If I went away like he wanted, this information would not be discovered and shared. I regret falling in to it with the haters and being ugly too.

Thanks for the info.?

Jason

Sara-

What a wonderful gift for your Father. I think the most important question to ask you is to ask if your father likes to make things he uses in ham radio? there is a certain amount to assembly that takes place in order to move the BITX40 from it's package to a point that it can be used daily. All though it is tested, it still needs to be connected properly to work. This is the fun part for all those that participate in this forum. We like to do things our way. So if we want to put it in a pre-made box we do so or if we want to gut a broken old radio and install it in that box, we can do that too. It can be quite an adventure as to exactly what we can do as? soon as we have it in our hands.

I suggest besides my comments and those of others here, to ask a friend of your fathers as well, you may know another ham operator in the area that knows your father's talents better than you.? In closing the radio was developed for voice, but it can be adapted to telegraphy- morse code or CW as we know it. I have a friend who made a contact from Tennessee in the USA to South Africa shortly after he assembled it. A distance of over 5000 miles or 8000+ Km..

chow chow paesano--- Larry W8LM

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As delivered, it is voice only (SSB). Telegraphy? (CW) requires modification but your father could easily perform the required modifications.

Bill

Thank you very much! I wat to buy this for my father (I1hkj). Can I ask you how it works for you? Do you use it in voice mode or also telegraph? (Sorry, i don't know all the technical terms, as I said, it's for my father).?

Thanks

Sara

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I am preparing to "breadboard" my BITX40 and get it operating before I drill and cut into that nice Instrument case I bought that I pictured in my last de W8LM post yesterday. I am going to make some purchases from one of my long time favorite parts places. Allelectronics.com. FREE Shipping if you order over $75. California to Kansas delivery about 2-3 days after I order.

One item I have bought over and over is 50 foot lengths of RG-58/U with BNC's both end. I wrote a review which I measured loss of the actual product and posted it. @ 10mhz 1.3db loss per 100ft. See my review here:

Shopping list..
1/4" shaft knobs:($1)
http://www.allelectronics.com/category/310100/knobs/for-1/4-shaft/1.html
1/8" shaft knobs:($1)
http://www.allelectronics.com/category/310200/knobs/for-1/8-shaft/1.html
42X25X38MM or 50x25x42MM H HEATSINK ($1 each)
http://www.allelectronics.com/category/270/heat-sinks/1.html
Speakers
http://www.allelectronics.com/category/580/speakers/1.html
Panel mount fuse holder (2/$1)
http://www.allelectronics.com/item/fhpm-53/agc/3ag-fuse-post-special/1.html
Power supplies 12V
http://www.allelectronics.com/category/914/ac-dc-wall-adapters/pwr-supplies/1.html
Prototyping bread boards
http://www.allelectronics.com/category/105/breadboards-and-accessories/1.html
12 MHZ CRYSTAL, HC18/U? 5 for a $1
http://www.allelectronics.com/item/cry-12/12-mhz-crystal-hc18/u/1.html
BNC inline coupler 90 cents
http://www.allelectronics.com/item/ug-914/male-bnc-coupler/1.html
MINI-USB TO USB CABLE, 3'
http://www.allelectronics.com/item/cb-422/mini-usb-to-usb-cable-3/1.html
Headphones
http://www.allelectronics.com/item/hp-100/folding-stereo-headphones/1.html

In addition to these items, they have hundred of components, resistors, inductors, ferrites, capacitors, LED's, Switches...
But the above is interesting to any BITX40 builder-- de W8LM

Wanted to report that I made my first contac today. Not a DX but still first contact is always exciting with a new rig (HFSigs BITX ver 3) and being my first qrp rig. I have a bitx 3c - thru hole next on my bench. Hopefully all will turnout well.?

Glad that there is a strong community that is willing to share and help. Made this a great experience?

73

Art. N2AJO

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I think the "cap discharge through a transistor" approach essentially achieves the same outcome?

After a couple of searches and some reading from the archives, I got a thought. ?Normally that's a dangerous thing, but I'll toss it out for the real experts just in case. hi hi

Would it be possible (or useful?) to add another relay and a slight delay so that when the PTT is pressed, the RX circuit is broken and there's a pause before the TX circuit is made?

I'm not concerned about the speaker noise, but rather the carrier pulse when PTT is pressed. ?Maybe giving the caps a couple of miliseconds to discharge when changing states would fix all the symptoms? ?Or maybe not?

Thanks,

Andy KG5RKP

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They are now showing up, Jason. From memory, the first post by a new member is always moderated, so it wont appear until that has occurred. That said, if you tried to make several posts before the moderation had occurred, I guess they would also be slow to appear.