Very nice. I wood use a radio like that. -- Lee - N9LO "I Void Warranties"

Another Wood Box uBITX! KC1FSZ Abandons Al-Fresco but Continues with Wood Another Wood Box uBITX! KC1FSZ Abandons Al-Fresco but Continues with Wood Radio electronics blog. Homebrew ham radio.

Perhaps these practical BPF hints could be of value https://martein.home.xs4all.nl/pa3ake/hmode/bpf_all.html Ulf SM0CGL

Attached is my driver it goes between VR1 and the outputs of T10 you need to remove C84 and T10 and insert this circuit. I am using the AMP signal to reduce the overall power output

The MMIC has a absolute maximum voltage of 4.5 VDC. Assuming you use a transformer (actually you must to get the drive level you need for the output stage) you an only use a +2 volt

I can see the insulation argument to why these are installed hanging on to the IRF510s but this puts a large mechanical load on the transistor legs and increases the risks of damage, especially if one

I would like to add my kudos to Kees for the neat board and micro smd parts. Glad I have magnified loupes and can still see them yet. Well done my friend. A sneeze and they will be history. Use a

Here is a filter designed with SVCFilt (at least a 20 years old ARRL programme) under Windows95 (hihi). Capacitors can be any ceramic (usually are rated at 50v) and inductors may be built with or

Many tuners are rudimentary highpass filters, especially at 28mhz, the spur may be far away to be attenuated somehow. Also a monoband may further attenuate that spur. To keep it as simple as possible

Sprint layout file uploaded to file folder GL

Allison, thanks for the heads up on EB63 design. I will avoid it and think about something similar to the Hardrock-50. It is a modern design and the parts are inexpensive. I will probably build the

These are inverse exponential responses, it won't be symmetrical. But the pot should help move it toward vaguely similar rise and fall rates. The integrator mentioned in post 50445 is capable of

Cool that all it took was a larger C1, that's a good result. From the scope traces, the rising edge is much faster than the falling edge. This is because the CW-KEY line from the nano is rising

And if you really wanted an MMIC for the pre-driver, here's a cheap one capable of 18dBm. $0.55 each if you get a reel.

This email is for those interested in using the transceiver for CW. Being mainly a CW operator, I was concerned about the V3 board uBitx transmit CW wave shape being very hard with an almost square

Here's an interesting part: https://www.mouser.com/ProductDetail/Infineon-Technologies/BFP780H6327XTSA1?qs=0DP5yvOrqYk3T8WgQ0FT4g%3d%3d From how it's described, I assumed it was an MMIC. But

I did find a 2n2222a datasheet, not the issue. Point is, it only gives Ft for a single data point, 20ma and Vce of 20v. The Rohm parts show a graph,of Ft over current for at Vce of 10v at 100mhz. I

Jerry, As and you get... Look at the tabular data as they are not spec'ed as RF devices. Also look at the 2n2219/2222 data sheet. They are the same die in different packages. Allison

Regarding EB63, Most I know had a great deal of effort trying to make it work and behave stable. Its not a forgiving design. The "real RF" transistors used are 40+ year old types that are not

Yup, you are right. Figure 8 on page 4 of https://www.mouser.com/datasheet/2/348/2scr513p5t100-e-1017538.pdf shows Ft drops below 300 for currents under 50ma when Vce is 10v on that Rohm part. The