From: "Junichi Nakajima" nakaji@... To: rod@... Subject: the "Rock-Mite" files Date: Monday, October 28, 2002 2:20 AM Dear Rod N0RC, Thank you the 14.060MHz 2-way QRP QSO long before. Very impressed with your Rock-Mites site, here I send you several files to present my Rock-Mite 40. I would be very happy if you show these in your web site. Note: The JL1KRA's Rock-Mite 40 is using a TAKACHI SW-125 plastic case $2 in Akihabara. Since I decided to put everyting into a box, 9V battery, paddles and even a small speaker was integrated to the box. 9V battery is switchable to an external DC plug. Paddles are coming from disassembled MK-44. A thin 0.1W speaker is used to monitor the QRP frequency. Strong stations and sidetone are audible in a room. Avoid several connections, just hook up an antenna, It enables to the air immediately. Two anntenas are prepared for the RM-40. One is telescopic 7MHz whip antenna with loading. The other is 7MHz dipole. These are the everything I need for the QRV, but except the sheep. Sincerely yours, JL1KRA Junichi Nakajima
Junichi, JL1KRA, adds a Jackson Harbor Press RMK keyer chip to his Rock-Mite
From: Junichi Nakajima To: n0rc Subject: Jackson Harbor Press "RMK-PIC" Rock-Mite installation report Date: Sunday, December 08, 2002 3:53 AM Hi Rod, N0RC I attached the post to QRP-L and additional images explaining the RMK-PIC installation. If you like, please use themt in youe web. Junichi JL1KRA/QRP firstname.lastname@example.org ----- Hi All, Received the RMK-PIC which enhance the ability of the famous Rock-Mite, Here I briefly report my installation.
Although one must disassemble the Rockmite, The installation is straightforward. Two modifications are needed to mount the RMK-PIC. One is the 10K-ohm pull up to 5V of Pin-4 of RMK-PIC. You just add the resistor between the Pin 1-4. Another mod is variable pot with two resistors in hot/cold end installation around "dah" input of RMK-PIC. There will be several choice to do this. If you need a external pod control, you would drill a hole to your chassis. Since I am not frequently change my keying speed, I placed a small variable resistor pod just above the dah input of the RMK board. >From the pod, two resistors are connected to 5V and Ground. I choose pick up points at the bypass capacitor lands nearby the U3 (RMK-PIC). These modifications are done within 30 minutes. Hooked up the DC, I can here the "FB" announce from the RMK-PIC. Selecting the pod calibration from functions and confirmed it works. I had been using the PK-x series keyer and all of the other functions are already friendly. Not only the pod-speed control, but the Bug/Straight mode, iambic A/B, reverse paddle, Beacons and non volatile Message memories are added to the Rock-Mite. You can use additional function by the combination pressing of the mem switch and paddle(dit,dah). Soon I recorded my CQ messages msg 1 and 2. Now the RMK-40 is CQing by itself continuously with beacon function. This will be absolutely useful in field operation. As a CPU upgrading of PCs, the RMK-PIC installation will bring you a lot of fun to your RMK-40 again. I am not related to JHB, but this is one of recommendation to enjoy your RMK! In addition, you can play with the original PIC by making simple keyer or transmitter :-). I really thank Chuck of JHB who provide us such nice PIC of well integrated function and the lowest price we have never seen. JL1KRA Junichi Nakajima