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When I was a kid, a friend and I discovered that a battery operated toy motor made a "nice" transmitter. We decided to get on the air. We strung the longest antenna we could, attached the antenna to

Justin, Do you know what version of the board you ordered? I see there is a version 1.02 that seems to be the newest. I guess they had some problems with the v1.01 but they’re fixed in version

Jerry, KF6VB, Ah yes.? The ARC-5. From post /g/BITX20/message/87274 This old post about bodging is also of interest: /g/BITX20/topic/5556886#30039

Actually, now I remember better. The VFO was not a high-class Heathkit. It was actually an ARC-5 transmitter. - Jerry KF6VB

Andrea, To verify that it is an rf problem, connect it to a dummy load and see if the same thing happens. I solved my issues with snap on ferrites on all lines connected to the uBITX including the

Or - a bit less intrusive - beef up the bypassing on the power leads. Also the key input lead. Maybe a cap across your key? - Jerry KF6VB

Jerry and others, I'm wondering if using the old RTTY technique of a varactor diode to pull an oscillator a few hundred Hertz for changing the Mark and Space frequencies, but actually using Audio to

Enclose the board in a metal box or make sure you have a balanced antenna.

Yes, doing digital writes to update the si5351 for FM modulation was mentioned in that old thread: /g/BITX20/topic/6256856#34064 But updating fast enough to get good audio would be a

Hello, Finally the problem with transmit fixed. I have replace Q12 with a new and transmitting on ssb working perfect.

Hello, i'm using a ver. 4 Ubitx with 2.8 " Nextion display, using in CW there is a strange problem, something the radio it's "freezing" during trasmission and i can't send no more CW and also i can

Justin I made the same choice for through hole. I built the earlier Barb variant with plug in band boards using a Si5351 module board. -- 73 Bob? KD8CGH

In terms of? ?code for the Si570 I? note this contribution has been done so the? Hardware from SDR kits? (UK) could potentially be made open source. There are subtle diffs between the? Si 571

Geez Jerry et al you are all a bunch of very useful an busy bees. What I have found in the meantime is that the Si571 has or had a VC pin. now? Sdr radio kits sells a full ham osc which is based on

Jerry at least you did not try to take yerself out as I did once at about 14 when I decided to see what would happen if I put a 90v mini neon across the HV terminals of a motor mower and gave the

A neater way would be to read the modulating audio from an adc pin and program it to update the frequency of the si5351 very quickly. I believe usdx does that ti generate FM.

Jerry - I ordered my last one on 3/28, it shipped on 4/3, and I received it on 4/7.? Won't be able to play with it until September, though... :-( 73, Justin B. KI5GKD

My embarrassment would be the relay-based computer science fair project that I tried to design in 6th grade.? It did work to some extent until the actual fair.? By then the relays were intermittent

A man after my own heart! Someday I may have to embarrass myself by describing attempts at building a spark gap transmitter while in early primary school. Those encyclopedia entries were just not

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