Patched - Icom M700 Mods

: If using an external non-Icom antenna tuner, you can adjust the tuning power level (factory set at 10W) between 5 and 20 watts by adjusting R247 on the Main Board and R19 on the RF Board . Quick Reference: Icom M700PRO "Soft" Mod

The M700 series is robust, but many operators find value in adjusting its output power. For the M700TY, output power is controlled by a trimmer resistor (R244) on the main board. One ham reports increasing output from 150W to 212W by rotating R244 clockwise by 15–20 degrees. Users have reported increases up to 250W, but this carries the risk of over-stressing components, especially for high-duty-cycle modes like FT8.

The modifications described in this article come with serious responsibilities.

Before operating a modified radio on any band, verify your local regulations and ensure you hold the appropriate license for your intended operations. icom m700 mods

Early production runs of the IC-M700 suffered from slight frequency drift when the radio warmed up. Clarifier (RIT) Installation

To enable continuous transmit across the entire frequency range (1.6 MHz to 24 MHz), remove specific diodes based on your exact sub-model revision.

The following modifications are standard for making the IC-M700 more user-friendly for amateur radio operators. 1. Frequency Expansion (MARS/CAP Mod) : If using an external non-Icom antenna tuner,

(Invoking related search terms for further research...)

On standard older models, removing (or cutting its lead) typically opens wideband transmit.

The solution revolves around a single wire bridge. Examining the logic circuits section of the service manual reveals that IC1006 outputs mute signals for frequencies outside the marine bands to pins P40 and P41. These pins enable a voltage called "TMU" (presumably Transmitter Mute) via transistor Q1003. The schematics show a wire bridge, W1037, shorting the base of Q1003 to ground. With W1037 installed, the transistor is never engaged to release the TMU voltage, effectively muting non-marine frequencies. By cutting or removing W1037, the radio can transmit on all frequencies. One ham reports increasing output from 150W to

A common complaint among audiophiles and DXers (long-distance listeners) regarding the M-700 is the audio filtering.

This technique is universally applicable to a huge range of modern Icom radios, including the M700. The core concept is that Icom often uses a set of surface-mount diodes on the main logic board to restrict transmit frequencies based on the target market. Removing specific diodes disables these restrictions.

Marine radios are factory-equalized to cut off low-end frequencies entirely. This maximizes punch and intelligibility through heavy atmospheric noise, but it results in harsh, tinny audio on the ham bands. ESSB and Microphone Matching

For these units, two solutions exist. The simpler approach, if the hardware supports it, involves entering the radio's advanced configuration menu. On M700PRO units, pressing ENT and 2 simultaneously while powering on grants access to an advanced mode where LSB operation can be enabled.