Adam, i think they are a 1A device. I have always used the 2n2222 for everything but they are about 600mA. I also have a bunch of metal 2n2222 which i always thought were superior but in fact they are not. Nostalgia told me they were better.

I dont have any of your PH2222s.

I think they are a Chinese clone of the original.

This is a wonderful example of evolution of parts through cloning.

In most cases i have found the clone parts superior to the originals especially when it comes to RF devices. Maybe the materials or construction process is better than previously.?

Its funny because we hang on to all these old devices thinking they were better in our minds, but more and more often they simply are out classed.

Nigel ZL1NAY?

On Tue, 24 Oct 2023, 1:25 am Adam Rong, <rongxh@...> wrote:

Guys,

I got very positive result trying Philips PH2222 as the final for Pixie2023. I got 3.5dB higher power.

These PH2222 transistors are rather old, but they just performed very well. Please share with me your result. Have you tried some transistors on hand?

Thanks,

Adam

I use a 8050 as Q1 and 2N2222 in final of my newly made 2023 Pixie. It works great but now about 200-500 cycles off frequency depending on using 9 or 12 volts. Power output is 1 watt at 12 volts.?

I converted to 20 meters by changing the final output inductor and two capacitors. 56 mH and 220 pf. No cap over the inductor.?

Wayne N9EGT?

On Mon, Oct 23, 2023 at 6:25 AM Adam Rong <rongxh@...> wrote:

Guys,

I got very positive result trying Philips PH2222 as the final for Pixie2023. I got 3.5dB higher power.

These PH2222 transistors are rather old, but they just performed very well. Please share with me your result. Have you tried some transistors on hand?

Thanks,

Adam

[Edited Message Follows]
[Reason: found 2019 "Rev D"]

Hey CRkits fans,

I found in one of my drawers a "D4D DSB Transceiver Kit for Digital Mode" that I ordered in May 2019. I have not followed the project since and have not opened the kit yet (yes I know, but too many other kits and projects...).

I have now seen on the website that there is nothing online for the old dsb kit, but for a new ssb version.

What would you recommend me to do now? Just build the old ft8 dsb version or can i modify it to the latest version?

where can i find the latest revision of the construction plan for the old pure ft8 version??The kit came with Rev A (May 2019).

(Edit: I found "Rev D - Oct 14, 2019", so seems to be no updates since 2019.)

thanks for your suggestions and help.

73 de John, DK9JC / AK9JC

在 2023年10月15日，22:33，Jim Burns <outbackerwb4ilp@...> 写道：

?

Hi Adam,

The link isn't working.

Jim WB4ILP?

On Sun, Oct 15, 2023, 10:18 AM Adam Rong <rongxh@...> wrote:

Guys,

I replied CQ on 15m this afternoon, and I had a lengthy rag chewing with Mr. Cho, BV6JO. We discussed about Kenwood radios, DIY and Hi-Fi. See this recap:

BD4AAQ took this photo while he was SWLing this rag chewing. Thanks BD4AAQ!

Thanks,

Adam

There are inexpensive synthesizer based VFO available based on the DDS chips or the Si5351 synthesizer chip. I would check these out if you want to add frequency agility to the kit.

Mike N2MS

On 09/24/2023 8:11 PM EDT Peter Parker <parkerp@...> wrote:


The most important upgrade would be frequency agility on both transmit and receive.
A 10 kHz shift would be great but even 5 kHz would be something.
There are so many cases where you could potentially make a contact but can't as the station calling is on a different frequency to yours.
You can do a lot with two crystals in parallel.
You could cover frequencies above the crystal with no inductance and very small series capacitance.
For example in the video I got 10 kHz shift above the crystal frequency with the small capacitance formed by my unsoldered joint. And for coverage below you could have an RF choke or two in series with the crystal. This could be a plug in arrangement similar to the crystal but where you swap a wire link with an RF choke for lower frequencies.

On 09/24/2023 8:11 PM EDT Peter Parker <parkerp@...> wrote:


The most important upgrade would be frequency agility on both transmit and receive.
A 10 kHz shift would be great but even 5 kHz would be something.
There are so many cases where you could potentially make a contact but can't as the station calling is on a different frequency to yours.
You can do a lot with two crystals in parallel.
You could cover frequencies above the crystal with no inductance and very small series capacitance.
For example in the video I got 10 kHz shift above the crystal frequency with the small capacitance formed by my unsoldered joint. And for coverage below you could have an RF choke or two in series with the crystal. This could be a plug in arrangement similar to the crystal but where you swap a wire link with an RF choke for lower frequencies.