Thanks Mike. I am using an Isotemp OCXO with a following MMIC amp that outputs about +15 dBm. It has 50 ohm output. So there should be plenty of output to drive the circuit. I imagine something in the

That's not what I've done so far. I have put the 122 GHz board inside a good sized aluminum box. Placing it in front of the dish would block quite a bit of the dish. I want to use a piece of brass wav

Hi Jim, Thanks. It looks like that would work. The tubing is not expensive, so I don't have a lot to lose in getting some of it and experimenting. 73, Zack W9SZ

This is all tentative. Mainly I'm collecting data on parts and availability. I may yet use an offset dish. I would definitely use the Chaparral feed for that. But thanks for the advice! I guess I'll d

I think there is a problem with my unit. I have not done any modifications to it yet. When it starts out, the LED turns on green, then pulses red for just a moment, then goes into an alternating red a

Thanks Mike. I measure 12.50 volts going into the board. I measure 12.50 volts going into the Murata regulator and 4.93 volts coming out of that. I measure 4.93 volts going into the 3.3 volt regulator

Yes, thanks. One thing I did was reposition the Murata regulator board so it was parallel to the main board instead of sticking out at right angles. Somehow, in the process, I lost R3 (100k ohms). I j

Yeah, it was a tiny bridged solder gap. Grrr ... Unit seems to be operating correctly now. I'll very cautiously do any further mods and see what happens. 73, Zack W9SZ

I just did the External Reference mod. Except I installed a jumper instead of R47 and C47, because these values are already there in series with the External Reference In connector. I connected it to

You need a PICkit3 programmer. There are many sources on Amazon and eBay. Also download the free MPLab program from the Microchip website. Have you done any PIC programming before? I have been program

There is some learning curve. There are some videos on Youtube showing more detail on how to do it. Here is one: https://www.youtube.com/watch?v=UiTKBwKBf6g 73, Zack W9SZ

What are the diameters of the holes drilled on the board for the ICP connector for the PIC? All I can find is size "F" but nothing noting the actual hole size. 73, Zack W9SZ Virus-free. www.avast.com

I inadvertently reversed the RXin and TXo leads to the RS-232 connector on my board. I connected the serial port, ran a terminal program and booted the transceiver. I saw nothing on the terminal displ

Hi Tim, No, the commands I enter are not shown on the screen and there is no "OK" after "Enter," 73, Zack W9SZ

Well, all I wanted to do was to change the callsign in Beacon mode. So I did it the long way. I changed the callsign in the 16F877A .ASM file, assembled the new file and reprogrammed the PIC. That was

Thanks Mike. That makes sense. It was the only value changed in the PIC in my unit. 73, Zack W9SZ

Thanks John. I'm using a US Converters "Ultimate" (XS880) USB to RS-232 converter. It uses an FTDI chip. I have been very happy with this unit. It is supposed to be one of the best USB to serial conve

I had an awful time getting MPLAB (any version) to work with my PICKIT3. So I downloaded the PICKIT3 stand-alone programmer: http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit3%20Programmer%20Appl

I have noticed since I first powered my unit up that, when first powered up after setting for a while, it boots and the LED changes as expected. If I turn off the power and then turn it on again withi

No one else has had this problem? Zack W9SZ