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- IC2SAT.7
-
- Cut this diode. Don't try to unsolder it... CUT IT. Take my word on it.
-
- WARNING: Don't pull the diode away from the board and leave it hanging.
- When you put the radio back together it is a very close fit and if you
- short the diode, the radio won't work. The PLL stays unlocked but no
- damage will occur. (yeah, I did that too :-)
-
- If you stop right here and reassemble the radio, you will now have extended
- RECEIVE capability after you reset the radio according to the instructions
- in the manual on the first page. And it REALLY is extended. My PLL was
- still locked up down around 88 Mhz and actually received FM broadcast
- stations although it obviously sounded BAD! :-) The radio freq. read-out
- now will go all the way up past 1 GHz, but that's just the dial read-out,
- check the Channel Indicator and when it goes to a "U" for "Unlocked" you
- can keep an eye on PLL performance, however I was amazed at where the PLL
- was locking up and the fact that it was actually receiving (albeit poorly)
- across a very very wide range. Yes, of course the sensitivity is way down
- the further you wander from the 144-148 design frequency range but it still
- is pretty impressive, and the new freqs. can be stored in memory and scanned.
-
- EXTENDED TRANSMIT:
-
- Look for the big IC directly in the middle of the main board on the front
- cover (IC-1 40608). Go to the bottom right corner of it. Move your eyes
- slightly to the right and you will see three chip resisters in a row.
- Just to the right of THOSE you will see three silk screened dots that are
- bracketed by a rectangle of white ink lines where a factory diode package
- would have gone. The "dots" form a triangle with one at the top and two
- at the bottom. Install a diode (1N914 or equivalent) with the cathode
- on the TOP dot and the anode on the bottom left dot.
-
- This will give you extended transmit from about 138-163 or so.
-
- But if you believe that trying to get a diode in there (without shorting
- out a lot of stuff) is impossible, (and you are very close to being correct)
- then FORGET this approach. Instead get Icom's diode DA (# 1750000160) and
- install IT in the same place.
-
- I tried using the 1N914, and it was a TOUGH job. It worked but looked
- horrible and was in imminent danger of falling off. I tried it out,
- verified that it worked... and pulled it right out. I have the diode
- DA pack on order now and will do it right when it gets here. I would
- politely suggest that you forget trying to use the 1N914 unless you
- have a micro-miniature repair facility at hand. (I did and still didn't
- like it).
-
- To avoid hate mail .... I have to remind you that it is illegal to transmit
- on the air with this radio out of the Amateur Bands unless a legitimate
- emergency exists. (Type acceptance and all that.)
-
- However if you (like me) plan on using it for a quick and dirty sig-gen
- into a dummy load, then it is the cat's meow!
-
- Mark Bitterlich WA3JPY
- Downloaded From P-80 International Information Systems 304-744-2253
-