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IK1HSS > VLF 28.02.99 20:38l 25 Lines 1113 Bytes #-9713 (0) @ EU
BID : 31269_I1YLM
Read: DL9EM GUEST
Subj: Help LPF
Path: DB0ZKA<DB0IGL<DB0FSG<DB0PV<DB0MAK<DB0HOT<OK0PKL<OK0PPR<OK0PJI<OM0PBB<
OM0PBZ<SR9ZAA<PP5BLU<IW9EXL<IW7CHV<IK6IHL<IW0QMN<IW5CWB<IK5SKV<I4UKI<
IK2YHJ<IK2QCA<I1YLM
Sent: 990228/1739Z @:I1YLM.IPIE.ITA.EU #:31269 [Torino] FBB7.00f $:31269_I1YLM
From: IK1HSS@I1YLM.IPIE.ITA.EU
To : VLF@EU
Hello dear fellows,
and thanks for reading this message: I wonder if someone of the LFgang is
able to help me with my trouble...
In short: I'm ready to go on the air (I mad some tests) but my rig has a
terrible habit: armonics suppression is very bad (2 armonic is abt 20 dB
down the fundamental, 3 is abt 40 dB down and so on).
Even if it is not good practice, living in the country this fact could be
not a problem .... unfortunately I'm living in a city condominium and, at
least in my house I can perfectly listen my keyed CW both on LW and MW.
Short wawes, FM TV seems to be not affected from this.
The solution on the theory is quite easy: use a LPF!
It's about a week that I'm struggling looking for a filter with low
passthrough attenuation ... I even tried a notch filter tuned on the second
armonic: this is reduced of abt 14 dB (not enough I mean) and with a second
notch added seems to be reduced a couple of dB more!
Did anyone of you the same trouble and may be a solution?
Thanks for your help
73 de Marco IK1HSS (Turin, JN35UB)
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