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Thank you, Mark. I do have the 4.7k ohm resistor installed and I will try to adjust the contrast as well. Perhaps that will fix the issue, save for my switch, which is not functioning and needs to be

I can imagine what that was like. I did not work in the space race, but, as a kid, a friends father worked for Autonetics and he would bring us to their employee open house events and we would get to

Hi Gus, Well, if you smelled something then likely something got a bit too hot! A couple notes: The black squares on the display is normal if you haven't adjusted the contrast for the diplay yet

Thanks much Mark.. -- John - N0CTL - Fulltime RV in a 40' motorhome

That is an interesting circuit. So it looks like the series resonate circuit is a low impedance at 40 meters passing the received RF to the receiver amplifiers. Then, when the transmitter is keyed up

i was excited to put together my Ubitx today after finally getting a roll of .5 mm solder yesterday. I’m not an expert by any means in electronics assembly - I’d say that my proficiency is

I really could use a good reference for a long lasting replacement relay for the uBitix transimit/receive relay, what say you ?

John, If you are looking at the 5" Nextion files under AJ6CU, then I was probably the last person to touch them. Unfortunately, I couldn't find any of the graphic files either when I made all my mods

As John, K0JD pointed out in post /g/BITX20/message/70894 the TenTec Argosy was using rectified RF to create the high DC voltage required for a PIN diode T/R switch.? As proposed in

Correction: Second paragraph here mentions it plus a couple other options with regard to TR switches: /g/BITX20/message/39746 Jerry, KE7ER

Tom, You need to poke around a bit further on qrpkits.com https://www.qrpkits.com/bitx20a.html Schematic is in that first assembly manual listed. Second paragraph here mentions it plus a couple other

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Same here Tom. I lived near Huntsville when I was first licensed, WN4CCA. I sent off for a NASA technical bulletin – “Telemetry”. Latest in high tech. Interviewed at IBM Huntsville, they showed

Eric, i have a couple of display protection boards left when you do your JackAl display de n2aie vince

I would appreciate assistance with the 40 please. After triple checking connections, I fired up. The display was blocks which adjusted with the pot on the Rad board. It was drawing 140ma on idle

Cool site. Fun to look once again, in the context of the era of Heathkit kits and the early space race technology, the electronic designs I poured over learning electronics design. Then think of now,

Hi, I found some reviews of the bitx20a. Did not find a schematic, yet. However, I found this CW transceiver designed by Dan Tayloe that has a couple of mosfets to cut off the RF to the receiver

https://www.vintage-radio.info/heathkit/

If you guys can locate, look for the bitx20a manual. It has a Tayloe T/R switching system. The other mod will be to keep the lpf relays powered up. The heaviest lifting is what we can do to avoid the

Interesting, I was looking around at sites that featured old Heathkit photos and product information. Found this link. Looks like someone is reviving Heathkit in Santa Cruz California. Maybe a