I have recently measured a couple of ICEs419 (6 band switched BPF) and a
Dunestar600 (similar to the 419) with an accurrate Vector Network Analyzer.
While frequency response is similar between both models on the lower bands,
the Dunestar is significantly sharper and has a higher ultimate rejection
(although not spectacular) on 20, 15 and 10m, at the expense of roughly 0,1
to 0,2 dB additional insertion loss vs the 419.
I chose the Dunestar for my application (SO2R-M/S).
I also have a single-band 160m W3NQN BPF which outperforms both the ICE and
the Dunestar in terms of insertion loss and selectivity
I have the data if someone is interested.
73 Juan EA5RS
-----Mensaje original-----
De: rfi-bounces@contesting.com [mailto:rfi-bounces@contesting.com] En nombre
de Jim Brown
Enviado el: lunes, 31 de diciembre de 2007 18:43
Para: rfi@contesting.com
Asunto: Re: [RFI] I. C. E. products question
I'm a member of NCCC, the Northern California Contest Club. A question was
recently asked on our reflector about the merits of various BPF filter
sets. ICE RF bandpass filters are fairly well regarded -- not nearly as
good as the W3NQN filters, but better than Dunestar. The W3NQN filters are
significantly better design (more poles), and thus more expensive. I own
seven ICE filters. Two were bought at hamfests, the others direct. QC,
however, is not so good. Of those bought direct, three were out of
alignment and needed to be returned for retuning (as measured on my HP
gear). Factory service was good, fast, and courteous.
The ICE filters are 150 watt filters. If you run more power through them,
and/or if you run them with a serious mismatch, you are VERY likely to fry
some capacitors. Most of the better power amps will hit full power with 50
watts drive. These filters between the radio and the amp should hold up
just fine. According to reports, the NQN filters have something on the
order of 20 dB more attenuation. Ya pays yer money, and ya takes yer
choice.
73,
Jim Brown K9YC
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