[Milsurplus] Any CME-50063/DB20 experts out there?
CL in NC
mjcal77 at yahoo.com
Sat Jan 18 17:55:59 EST 2020
If you are familiar with the RME CME-50063/DB20, preselector/amplifier, wonder if you noticed some irregularities in the schematic and alignment procedures? There are 9 trimmers in it, 3 you set at 1MC that are used on all bands and are across the main tune cap., the rest across the bands up to 30MC. On Band 4, the 7MC adjustment uses a trimmer that is selected first on Band 3 which is not mentioned as part of Band 3 alignment. Band 3 setting was lumped into the settings of the main tuning cap trimmers at 1MC. I noticed peaking band 3 at 5MC with cap CG worked better than peaking it on Band 4 at 7MC with the same gain results on both bands. Bands 5 and 6 peaked fine on the remaining trimmers as instructed except for the last adjustment for 30MC which was also one of the caps, CD, set at 1MC, and had little effect. I have the original instructions for the DB20 from RME, but maybe there was a correction? Also, found it odd that the schematic drawn with the band switch in Band 6 where conventionally it would be at Band 1.
Charlie, W4MEC in NC
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