Drake NB needed

[Fuqua, Bill L]

Don't have one but just looked at the circuit and the SPR-4 receiver.
Drake seemed to have never understood how to make good noise blankers.
I thought, at a glance of the receiver schematic, there was a chance they got it right for the SPR-4
because the connector for the NB was before the crystal filter where the signal path bandwidth was
resonably wide , a MHz or so, but when looking at the noise blanker schematic I noticed the first thing the signal
hits is a crysatal filter. As soon as the bandwidth is reduced to a few kHz the NB does not function much better than
an audio noise limiter when it comes to short duration pulse noise. As far as I can tell Drake has been the only
receiver manufacturer that has done this.

73
Bill wa4lav

________________________________________
From: Boat Anchor Owners and Collectors List [BOATANCHORS at LISTS.TEMPE.GOV] On Behalf Of Bob Jackson [bob at NOFROWNS.NET]
Sent: Friday, August 13, 2010 4:56 PM
To: BOATANCHORS at LISTS.TEMPE.GOV
Subject: [BOATANCHORS-TEMPE] Drake NB needed

Fellow BAers -

I'm looking to buy a noise blanker and/or crystal calibrator for the Drake SPR-4 radio. Any/All assistance appreciated.

73,

Bob  AG5X

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