[TenTec] Ten-Tec/International Radio Filter Comparison
Mon, 20 Jul 1998 14:16:30 -0400
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I have been following Clark's thread on the [currently available]
International Radio crystal filters for Ten-Tec Radios and have put
together the following comparison chart based upon Ten-Tec Data Sheets and
info supplied by International Radio (W2VJN) and Clark (WA3JPJ). In the
case of the CW filters, there is a direct comparison between TT and IR
based upon nominal BW, while in the case of the SSB filters, there is NO
comparable IR filter to the TT filter(s) based upon (nominal) BW.
This comparison is of data sheet data only...as soon as I can purchase a
set of IR CW filters, I will run lab test comparisons and post the info.
This comparison does not include a planned 400 Hz BW 9 MHz filter to be
made available by IR.
73, Dave, K1FK
Fort Kent, ME
Mfr Model Poles -6dB BW (Hz)  -60dB BW (Hz)  SF Insert Loss
TT 285 6 500 (nominal) 1450 2.9:1 5.5 dB
IR 750 8 400/500 756/945 1.89:1 4.7 dB
TT 282 6 250 (nominal) 850 3.4:1 11.5 dB
IR 751 8 250/330 525/693 2.1:1 7.5 dB
TT 220 8 2400 4080 1.7:1 2.2 dB
TT 218 8 1800 3240 1.8:1 2.0 dB
IR 752 8 2100/2150 3675/3762 1.75:1 1.8 dB
 International Radio specifies a minimum and maximum -6dB BW based upon
a sampling of production filters. Ten-Tec specifies a nominal BW at the
-6dB point for the NS filters.
 The -60dB BW was calculated by multiplying the nominal -6dB BW by the
shape factor in the case of the Ten-Tec (NS) filters and the
minimum/maximum -6dB BW by the shape factor in the case of the
International Radio filters
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