I just completed building the “Frog Sounds HAM Radio QRP Kit Telegraph CW Transceiver Receiver Radio Station V3” available on Ebay for $15 shipped from China.
Some notes on this kit:
- The instructions are terrible. Some are in Chinese.
- You will definitely need some kind of magnifying glass or goggles to differentiate the values of the various components. I taped them to a sheet of paper and wrote the part numbers next to them, e.g., CP1,CP3,CP5, R1, etc. This was very helpful.
- There are extra parts included, which was confusing, but ended up being a good thing after I soldered the wrong capacitor in – I was glad there happened to be included an extra of that value.
- The rig has a red/green led that shows green for rx and red on tx. When installing, the short lead is the green, middle lead is the red, and the longest (middle) lead is the common anode.
- I got a different board from the one in the photos and in the included photocopied instructions.
- The included crystals are 7.023, which is a portion of the 40 meter band reserved for Extra class ops in the US. I am a general so I have some 7.030 crystals on order.
- Its important not to transmit without an antenna as it will destroy the transmit circuit.
The receive band is very wide. The first time I turned it the CQ WPX CW had just started and the band was going crazy. It is very difficult to pick out a CW signal when you can hear 4 or 5 at the same time. I imagine it will be easier once the contest is over. Here is a sample of the contest in full swing:
And, using my 40m dipole, with only 9 volts this little rig really got out – calling CQ, K1TTT of the Reverse Beacon Network picked me up as far away as Massachusetts – 323 miles away.