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EB8CWD > QRP 05.03.01 10:44l 34 Lines 1353 Bytes #-9093 (0) @ WW
BID : 1055-EB8CWD
Read: GUEST
Subj: SSB 455Khz ladder xtal filter
Path: DB0ZKA<DB0FSG<DB0SL<DB0LAN<DB0MRW<DB0ERF<DB0FBB<DB0GOS<DB0PKE<DB0OVN<
PI8JOP<EA3RKU<ED3ZAG<EA3RKD<EA8DW
Sent: 010303/2200Z @:EA8DW.EATF.ESP.EU #:63761 [Tenerife] FBB7.00g $:1055-EB8CW
From: EB8CWD@EA8DW.EATF.ESP.EU
To : QRP@WW
[¯¯¯ TST HOST 1.43c, UTC diff:5, Local time: Sat Mar 03 21:46:53 2001 ®®®]
Dear OM
I would like to experiment trying to build a SSB generator for a QRP TX,
but the problem is about buildind a ladder xtal filter to eliminate one
of the two side bands, so if carrier is 455KHz, what xtal (frequency)
should I use to eliminate, for example, 453Khz (LSB) ????
I have been looking for some info in Internet and I found that the
capacitors which are connected between each Xtal to ground fit the
bandwidth, but my doubt is the frequency of the xtals and how get a ladder
xtal filter center for a frequency, for example if I want to TX in USB,
a filter centered in 456KHz (USB)
Many tks.
BYE & 73's de ISAAC
P A C K E T E E R
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