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- From: rats@ihlpm.UUCP
- Newsgroups: rec.radio.shortwave
- Subject: Realistic PRO-2022 Cellular Restoration
- Message-ID: <9109301350.AA24169@ucbvax.Berkeley.EDU>
- Date: 30 Sep 91 13:50:04 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Lines: 49
-
-
- Cellular Restoration on the Realistic PRO-2022
-
- The Realistic PRO-2022 certainly is a look-alike for the all-time
- popular, but now-discontinued, PRO-2005. But is the similarity only
- cosmetic? What tricks can be done to increase the utility of the
- lower-cost 2022, now availible from Radio Shack and Grove Enterprises?
- Of the greatest interest, can cellular phone coverage, censored at the
- factory, be restored? Yes.
-
- After removing the two upper back screws and the top lid, locate the
- black cable just behind the front panel. Adjacent to the cable are
- four diodes locations: D42, D43, D44 and D45.
-
- D42 is not present; installed, it adds the 68-88 MHz
- European mid band (which includes the US 76-82 MHz
- mid band), removing the US 30-54 MHz low band. Even
- if a switch were installed to allow the diode to be
- selected, additional components and realignment are
- necessary for that higher frequency coverage. Don't
- do it!
-
- D43 is present, allowing the 800 MHz band to be received;
- the diode may be deleted so that the same microprocessor
- may be used in scanner modles which don't have that
- 800 MHz capability. Don't touch it!
-
- D44 is present, deleting the cellular mobile and base
- frequencies. If one lead is cut, total 806-960 frequency
- is restored, including 30 kHz steps in the cellular
- band. Keep in mind, however, that mobile telephone
- eavesdropping is prohibited by the Electronic
- Communications Privacy Act!
-
- This modification may void your warrenty; it is best to cut the lead
- carefully, gently separating the gap slightly so that it may be resoldered
- in case the radio needs warrenty repair later.
-
- D45 is not present; installed, it makes the cellular 30 kHz
- increments change to 12.5 kHz. A small SPST switch
- connected in series with one lead of a 1N914 or 1N4148
- could allow selection of the 25 kHz step interval in
- those areas which utilize that channel spacing.
-
- To do this, it is necessary to unsolder a shield under the circuit
- board which covers the solder pads for the diodes. Such a modification
- should only be attempted by someone familiar with electronic circuitry.
-
- [Excerpted from Monitoring Times, June 1990, page 89.]
-
-
-
- Copied from the QRZ! Windows Ham Radio CDROM
-
-