[TenTec] TenTec 9MHz Filter Identification

[Gary Hembree]

A couple of people replied to my request for Tentec 9MHz 4-pole 2.7KHz 
BW and model 219 filters saying that they had filters which were 
marked poorly and they couldn't identify.  The following table 
(information obtained from Ten-Tec) lists the stock codes which may 
appear on the various 9MHz filters that they use.

Model    Center f(MHz)   BW(Hz)    Z(in/out)   #Poles   Stock Code
 216      9.002210        500        200          6       48161
 217      9.000750        500        200          8       48036
 218      9.001500       1800        200          8       48037
 219      9.000750        250        200          6       48055
 220      9.001500       2400        200          8       48058
  -       9.001500       2700        200          4       48057

 Number of poles equals number of crystals on the filter board. 

Note that the 4-pole has no model number because it wasn't sold as an 
accessory filter.  This filter was stock in the Argosy tranceivers on 
the RF/MIXER board and in the Corsair tranceivers on the NOISE BLANKER 
board.  It does have a stock code which should be stamped on one of 
the crystals or perhaps on the PC board.  All of the ones I have 
purchased to date (3) have this number stamped on a crystal along with 
a date code (i.e. year and week: 8217).
My accessory filters (5) all have the model number and a date code 
stamped on them, except for the latest 217 (1997) which also has the 
stock code.
This information should enable you to ID those mystery filters that 
are laying around the shack!
73
Gary, N7IR
gary.hembree@asu.edu

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