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- ICOM R7000 alignment
- ====================
-
- Your ICOM R7000 may be slightly off frequency.
-
- So was mine. Being a perfectionist I put up with it and gritted my teeth
- daily.
- The signal center meter was off too; and inconsistent in its inaccuracy from
- band to band. Finally, as the warranty was near expiration, I sent it back to
- Bellevue. They did a re-alignment and included a work order sheet that was
- most impressive.
-
- Well, now that you are out of warranty, you can put the thing on frequency!
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- Open the box, remove the metal covers on the right hand circuit board that
- cover the master oscillator, and tweak the coil (I think it's L39 on the
- PLL reference oscillator board). I took advantage of the fact (or probability
- at least) that commercial services are very nearly on frequency. so I set the
- radio on a known 480MHz station, and tweaked for zero deviation on the meter.
- If the IF is aligned properly, center on the meter should correspond to
- having the xtal on frequency.
-
- All crystals age, and it is worth knowing how to correct for it.
- This is cheaper and more reliable than sending the unit to Washington.
-
- Marc Kaufman
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- via G4SPV BBS>
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