On Thu, 24 Dec 1998 11:00:28 -0800 firstname.lastname@example.org (marv gonsior)
>--------- Begin forwarded message ----------
>From: "Phil T. (VE3OZZ)" <email@example.com>
>Subject: Re: [AMPS] I.C.E. filters - reply to Carl
>Date: Thu, 24 Dec 1998 08:45:51
>>>the filters. Marv sited high insertion loss at 29 MHZ amongst other
>>Hmmmm. I mentioned experiences that Marv then commented on, guess
>> >Let me repeat that after a very early problem I have been 100%
>>73 Carl KM1H
>I think you're right Carl. I think I got 7 e-mails about ICE
>Rather than recite all comments in those e-mails, I chose to just
>"summarise" the general gist of them in this most recent post. Marv
>were back and forth a few times about this subject 'off-line', so
>comments ended-up sticking with me. Now I must admit that I did
>forget that you had stated that you were happy with more recent ICE
>apologies. I'm perhaps a good example of what happens when an issue
>like this comes up - after some time passes, I remember all the
>Since my comments to Phil were being utilized here, in fairness to
>I.C.E., the FULL extent of them should be provided to all concerned.
>told Phil that I was NOT familiar with the quality of I.C.E.'s CURRENT
>products but that I did have reservations from my earlier
>My appraisal of their filters was based on measurements that were made
>by three different test setups; mine, another by W6GNX, and with both
>of us using HP141T/8443 Spectrum Analyzers/Tracking Generators. This
>was followed, most significantly, by those made by an HP Tech Rep who
>demonstrated his measurments on a number of different LPFs to a
>gathering in 1992. He was using their finest HP Network
>Analyzer/plotter. With that system, he demonstrated that the I.C.E.
>LPF and BP filters did not meet their specs. However, one must
>remember that this was a relatively small sample and that I.C.E.
>apparently had changed their filter design in the early days of their
>operation. Since their nomenclature did not
>change, it would be difficult to determine which version was under
>I have two reservations..........based on what I last saw. One, was
>the risk of cold flow in the Teflon capacitors causing drift plus
>possible arcing. Secondly, is the possible lowered Q in the filter
>elements due to
>the relatively small shielding enclosures in which they are housed.
>It is rewarding to learn that their policies regarding product
>are so exceptionaly good as this is often not the case elsewhere.
>Since I believe that there are many of us here, looking for a top
>notch LPF, it would be a great service to all concerned if I.C.E.
>would post their current, detailed specs including their Swept
>Frequency response and
>Return Loss measurements.
>HAPPY HOLIDAYS TO ALL!
Good post Marv. I should dig my ICE's from behind the amps and bring them
to work where I sit in front of the latest HP toys.
In fact if anyone wants a report and hard copy plot on a filter, send it
on to me and I'll get it returned within 2-3 working days.
I can test just about anything in the 10MHz to 50GHz range. For a small
(a case of Michelob Light !) I can also run over any temperature from
-125 to +125C.
After the normal work hours stop at 11PM the personal projects from
several of us techs start; I work 2nd shift which is totally laid back
and the Prez knows it ( we also beat 1st shift in production) . A few
good Blues CD's cranked up and the fun begins!
73 Carl KM1H
>The ICE units appear to be robust well made units, and they are a
>reasonable price. It would be a shame to overlook using a product
>of negative impressions that aren't fully justified.
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Administrative requests: amps-REQUEST@contesting.com
>--------- End forwarded message ----------
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