Charlie : You will need to add the two additional resistors if you want to use paddles on CW with the KD8CEC firmware. Also you would require a hardware mod for the S-meter functionality on the 2.8"

Hmmm...I've had some issues with mine. I wonder if I may have reverse powered it before I realized the pad by the 5V marking was ground. I don't imagine that would be good for it. I guess I could

My only complaint about the case is there are no bare spots for grounding. Also no star washers for grounding. Apparently case ground was not an issue. I really do like the looks and

I followed Joe's (VE1BWV) lead and checked out Robotshop.ca and found the 2.8" display for about $25 CAN. This is a pretty reasonable deal and it showed up in a couple of days. We will see how long it

If all I need is to use the ubitx as a 28Mhz IF for a 2m transverter then all I need is a 28mhz high-pass, correct? I would think that it would be easy enough to build a high-pass in order to kill

Table two of the arrl.org filter reference shows that the 21 mhz bandpass filter has 15db of attenuation at 28mhz, that's 7mhz away. We need something like 20 dB of attenuation at 2mhz away. As

I'd recommend you check to see if the transverter takes care of the spur for you. At 28mhz, the spur is at 45-28=17mhz going in, and something around 30 dB down from your 28mhz signal. The transverter

The various BITX transceivers present an interesting and educational opportunity to determine the accuracy of our test equipment, test procedures, and interpretation of all the above.

On 21Mhz rather than a band pass/high/low filter what about 23mhz trap(s) also called notch filter. Even high Q should be wide enough to cover whole 23.8 to 23.55Mhz. Similar for 24Mhz

I am not sure if 28 mhz is a problem. I am travelling so I will go back and check. I switched to 4 filters to be fcc compliant from 3.5 mhz to 28 mhz. - f

Beautiful! Jack, W8TEE

Spend a weekend with a Nano, the OLED, and a breadboard and the example code and you'll have it working in less than a week even if you don't know programming. If I had JackAl tucked away in bed, I'd

Very neat Peter!

Hello fellow constructors I have been thinking about using a common heat sink for the RF power transistors, insulated with mica washers of course and insulated mounting hardware. Would there be inter

The four transmit filters we have are all low pass filters. The spur Allison found is below the operating frequency, so those filters don't touch it. When operating at 28mhz, the spur is at 45mhz -

I believe that should work fine. Given the significant power and the relatively low voltages, the impedance at the drain is quite low. A little bit of extra capacitive coupling is not too disruptive.

Thanks, everyone, for the comments. It is great information. Looks like I need to wait a little longer. 73 Mike KK7ER

You missed my point Jerry. I am not suggesting 2822D. Please see the spec sheet I attached. It is a lower power version oftda2822. I think that die is being repackaged as TDA2822 in 8 pin DIP.

You think the WX might be a repackaged TA2822D meant for the SOIC8? I doubt it. I think the WX is a cheap copy that simply doesn't meet the 15v absolute max spec We had reports that there are clones

Would be interesting to pop the lids off the various TDA2822 parts, examine the die under a microscope. I'm betting the WX looks significantly different than an ST.