If anyone is interested in modifying the Alinco DR-1200 Dataradio for 9600 packet use, here is the info. I recently purchased this radio, in the hope of modifying it for 9600 packet use, as the advertisements mention. Being true fm and not phase modulated, I thought this radio would be a true performer at 9600 baud. What I didn't know is that there is no info in the manual on how to hook up the G3RUH modem to it. Luckily I bumped into the May 1992 issue of CQ Amateur Radio, and on page 69, Buck Rogers, K4ABT, describes how to modify the Alinco DR-110T for 9600 baud use. I was almost sure the dataradio was nothing else than a DR-110T with no mike, an LED panel, 25w output and a catchy name. Comparing the insides of the dataradio with the dr-110t mods showed it was the same. To inject the Tx audio is a bit difficult. The VCO unit is enclosed in a solid metal case, withe the PC board hidden away.When opening the unit, the VCO is located to the left side, just behind the VFO knob. You must unsoldier the VCO unit out of the main board. It is held by its case at 4 points. Under the VCO unit are 10 pin connectors. These must also be unsoldiered. I used a Radio Shack desoldering iron, and was a piece of cake to remove. Once you remove the VCO unit, look at PIn 7 on the soldier side of it. This pin will go all the way to a surface mounted resistor, and next to it is the varactor diode. Soldier a 1/4 watt 10K resistor to the junction of the resistor and the diode. The diode is surface mount, so be very careful. Then connect the TX audio cable to the other end of the 10k resistor. K4ABT suggest to use a 4uf non-polarized capacitor after the resitor, but I didnt use it and worked ok. 1 o 2 o 3 o 4 o ----- 5 o _ || D | 6 o | | ----- 7 o -------|R| \ 8 o - Soldier here 10K resistor 9 o 10 o To get RX audio from the discriminator, locate a PC board sticking up next to the lithium battery backup. behind the volume. You can see at the top a 16 pin surface mount chip, labeled MC3361F. Pin 9 of this chip is the discriminator output. It is also tiny, so be careful. | | | | | | | | <---- Soldier RX cable here. --------------- | MC3361F | | | --------------- | | | | | | | | As all 9600 baud work, USE SHIELDED AUDIO COAXIAL CABLES! I did the mod, and TX and RX are absolutely perfect. For the price of this radio, it is a great performer. 73's de Ramon (KP4TR)