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Re: Wanted: 1500 Hz filter (Noble FILTERS)
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Joseph K7CBR
Some fair points in your statements. Yes all filters will eventually fail, yet many will be doing this outside of the current life expectancy of the users. Mechanical filters fail, crystal filters fail, and no the sky is not falling... I mentioned this as something to look out for and if there is any due diligence on this subject? It would be much better to start with new. Drake ran these filters in equipment that held a high ambient temperature, so this can accelerate aging in these devices. Perhaps everyone is so used to discussing things in terms of it's "black" or "white" that assumptions are made as such. In the last 30 years, I have had two mechanical filters fail and three crystal filters fail. Failure modes vary from excess loss, to excess ripple, passband shift or distortion, a DC blocking failure, it makes no difference. We still need a replacement.
On Monday, December 23, 2024 at 12:11:08 PM EST, Jeff AC0C <keepwalking188@...> wrote:
I don't want to pick nits here but the statement that all filters will fail, and it "could be now" is just not setting the expectations properly.? I agree that some filters do fail over time for a variety of reasons, but my experience is that most filters will live longer than the gear remains operational otherwise.? And when gear breaks, from a "things that will likely die first in old gear" - a crystal filter is not remotely near the top of that list by a long shot.?? Casual readers on the reflector may get the impression from this
claim that filter failures occur more than it does simply because
this reflector has a much higher concentration of guys doing
restoration work.? That does not comprehend the far greater number
of guys with a Drake (or other older radio) sitting on their desk
that has given great service over the years and continues to work
today.? Maybe some of the old hands at Drake gear may have a specific
exception to this.? Here I'm reminded of the Yaesu bias applied to
the old Murata filters which did lead to many of them dying over
time - not a filter fault per se, but rather a failure by Yaesu to
DC isolate the filter, as an example. 73/jeff/ac0c alpha-charlie-zero-charlie On 12/23/2024 7:55 AM, Steve Wedge,
W1ES/4 via groups.io wrote:
I
don't need one at the moment but I'd be willing to get a new 600
Hz filter for my TR-4cW RIT.? I actually had one in another rig
fail and I was fortunate enough to be able to take it apart and
fix it using the baking method but these do fail? Are there any
other TR-4cW owners who would be willing to do this?
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, December 23rd, 2024 at
8:17 AM, Joseph K7CBR via groups.io
<k7cbr@...> wrote:
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