Transcript
KB2LJJ Radio Mods Database and Manuals
IC-2820 Expand Mods Cross-band procedure
Remove D136 for mini repeater and sub-band remote control function." "No installed D136 in the USA-1 version (#05)." The D136 is the right diode on the 8th row.
www.r6-ru4montesecchieta.it
I have not tested this.
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IZ5CCV
KB2LJJ Radio Mods Database and Manuals
I have tested on my IC2820 the diodes guide for extended bands. Please, open the down side and look at the two rows of diodes on the right side, placed vertically (foto 1).
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KB2LJJ Radio Mods Database and Manuals
From up to down (foto 2):
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KB2LJJ Radio Mods Database and Manuals
+ + + +
First diode is not present Remove second diode: 144-150 Mhz 430-450 Mhz auto-repeater USA Remove fourth diode: 144-148 Mhz 430-450 Mhz Remove fifth diode: 144-148 Mhz 400-470 Mhz Remove sixth diode: 137-174 Mhz 400-470 Mhz Seventh diode apparently it doesn't change anything ???????????? Applying the eighth: cross-band is activated
To activate cross-band procedure, press and hold two main band knobs and press ; the radio will beep and the key symbol on the left side of the display will flash; now the radio is now active in the cross-band mode. To cancel the cross-band repeat function, please press . http://www.kb2ljj.com/data/icom/ic-2820.htm (4 di 9)25/08/2009 23.17.13
KB2LJJ Radio Mods Database and Manuals
Good test, Luca IK0YYY, Rome, Italy.
IC-E2820 137-174MHz / 400-470MHz
Uitbreiding: 137-174MHz / 400-470MHz ● ● ●
Onderzijde verwijderen (7 schroeven) Zie fig 1 & 2 voor de positie van de diodes. D1-3-8 zijn niet aanwezig
Verwijderen diodes geeft: ● ● ● ● ● ●
D2 144-150 Mhz 430-450 Mhz D4 144-148 Mhz 430-450 Mhz D5 400-470 Mhz D6 137-174 Mhz D7 / D8 plaatsen + CROSS BAND
Verwijder D5 voor UHF en D6 voor VHF
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KB2LJJ Radio Mods Database and Manuals
RX Fan Silencer Mod http://www.kb2ljj.com/data/icom/ic-2820.htm (6 di 9)25/08/2009 23.17.13
KB2LJJ Radio Mods Database and Manuals
Author: Richard pa7fa I use my IC-2820 mainly for RX. Annoying is the FAN, which swiches on / of during the day, and produces a lot of noise, while i do not find the Icom 'hot' or even 'warm'. Icom designed the fan circuit in such a way, the fan switches on at approx 28 degrees C. I dived in the circuitry, and found a way to lift this temperature to approx 35 degrees C. The mod if fairly simple, by just replacing a resistor, however the difficulty rate goes sky high if you see how large the resistors are these days. We are talking about R510 on the main unit. The resistor is located under the speaker, and can be accessed by lifting the top cover, and removing the speaker. At the top of the diagonally placed IC25 you will find the resistor. It is attached to PIN 71 of IC25. I marked the resistor in RED on the picture below. You can do 2 things: 1. Replace the resistor (originally 39 kOhm) with a resistor of 22 kOhm. 2. solder a resistor in parallel with the original one. in that case, you don't have to remove the very small original resistor, and thus can make things easier. You will need a resistor of 56 kOhm to use this method. If you successfully modified the IC-2820, you will never hear the fan again in normal circumstances. My fan is silent for over 6 months, and my rig works just fine. http://www.kb2ljj.com/data/icom/ic-2820.htm (7 di 9)25/08/2009 23.17.13
KB2LJJ Radio Mods Database and Manuals
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KB2LJJ Radio Mods Database and Manuals
ATTENTION The KB2LJJ takes no responsibility for any damage during the modification or for any wrong information made on this modification.
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