Here are some measurements I made on K1ST's ICE filters several months ago.
This little article just appeared in the YCCC 'Butt.
Don't reproduce without my permission.
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ICE Filter Performance Data
by Dave Pascoe KM3T
After the CQWW Phone multi-multi effort at K1ST, Steve Tolf (K1ST)
lent me his ICE (see ad in CQ Magazine) filters so that I could
measure their performance. ICE manufactures a set of individual
bandpass filters (transceive) for you to install between your exciter
and amplifier.
I tested the 3.5, 7, 14, 21 and 28 MHz filters, in addition to the ICE
6kW lowpass filter. The measurement results are summarized below and
in the photos showing the bandpass responses of the filters.
Data was taken with a Hewlett-Packard HP3585A Spectrum Analyzer.
Measured Data:
ICE Model 404 Bandpass Filter (3.5-4.0 MHz)
Insertion loss: 0.25 dB
Out-of-band rejection at:
1830 kHz: 26.4 dB
7200 kHz: 15.15 dB
14160 kHz: 26.0 dB
21210 kHz: 31.45 dB
28500 kHz: 36.5 dB
ICE Model 405 Bandpass Filter (7.0-7.3 MHz)
Insertion loss: 0.5 dB
Out-of-band rejection at:
1830 kHz: 63.6 dB
3720 kHz: 42.05 dB
14160 kHz: 30.9 dB
21210 kHz: 38.4 dB
28500 kHz: 43.45 dB
ICE Model 407 Bandpass Filter (14.0-14.35 MHz)
Insertion loss: 0.6 dB
Out-of-band rejection at:
1830 kHz: 79.3 dB
3720 kHz: 59.1 dB
7110 kHz: 37.1 dB
21210 kHz: 24.2 dB
28500 kHz: 31.5 dB
ICE Model 409 Bandpass Filter (21.0-21.5 MHz)
Insertion loss: 0.8 dB
Out-of-band rejection at:
1830 kHz: 83.3 dB
3720 kHz: 76.7 dB
7110 kHz: 60.5 dB
14160 kHz: 34.0 dB
28500 kHz: 25.7 dB
ICE Model 411 Bandpass Filter (28.0-29.7 MHz)
Insertion loss: 0.8 dB
Out-of-band rejection at:
1840 kHz: 81.8 dB
3720 kHz: 78.5 dB
7110 kHz: 60.2 dB
14160 kHz: 37.5 dB
21200 kHz: 14.0 dB
ICE Model 421 Lowpass RF Filter (DC-30 MHz)
9th degree design, 70dB attenuation above 32 MHz
Handles 6 kW PEP
Measured:
Insertion loss: 0.2 dB
Rejection at:
40 MHz: ~57 dB
If you have questions regarding the ICE filters, please give them a
call. Their ad is in recent issues of CQ Magazine.
--
Dave Pascoe KM3T
pascoe@rocky.gte.com
GTE/SCSD - Needham Heights, MA
(617) 455-5704
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