From sydbowen at gmail.com  Wed Mar 15 09:30:48 2023
From: sydbowen at gmail.com (J Bowen)
Date: Wed, 15 Mar 2023 08:30:48 -0500
Subject: [1000mp] SP8 owners question can someone measure the inductors?
Message-ID: <CAL4Fa0PuTphHc4oobMsyk-YySQsWCMGq5zvQnnLd_UNi5P4ZKg@mail.gmail.com>

Hey, I'm trying to figure something out. Does anyone own a SP-8 speaker
that can measure the dimensions of the inductors on the filter board? I'm
trying to make an audio filter and was wondering whether they are the
Allied Component RDC20 or RDC30. Thanks!

Jason Bowen, KB5VXX

From jcm at lentel.com  Wed Mar 15 10:50:37 2023
From: jcm at lentel.com (James )
Date: Wed, 15 Mar 2023 14:50:37 +0000
Subject: [1000mp] SP8 owners question can someone measure the inductors?
In-Reply-To: <CAL4Fa0PuTphHc4oobMsyk-YySQsWCMGq5zvQnnLd_UNi5P4ZKg@mail.gmail.com>
References: <CAL4Fa0PuTphHc4oobMsyk-YySQsWCMGq5zvQnnLd_UNi5P4ZKg@mail.gmail.com>
Message-ID: <em646c76ff-ba74-4a5e-84da-e694cb7be981@c30d51a4.com>

Always use headphones with thw 1000MP so I can not answer about insides 
of an unseen SP-8 speaker.  However, from using inductors for many years 
I can note that knowing the physical size of an inductor will inform one 
very little about its inductance nor about its self-resonance frequency. 
  As I recall, the Internet has described several passive audio filters.  
Once upon a time 88 mH inductors left from compensating telephone lines 
were central to the design of audio filters.  I have a passive such 
filter useful for CW.  FairRight (spelling?) presents a lot of 
information abut properties that may assist.  Of course, a 1000MP has a 
lot of filtering capability as it stands.
Good luck and let us know what you eventually craft.  73  Mac   N8TT


------ Original Message ------
>From "J Bowen" <sydbowen at gmail.com>
To 1000mp at mailman.qth.net
Date 3/15/2023 9:30:48 AM
Subject [1000mp] SP8 owners question can someone measure the inductors?

>Hey, I'm trying to figure something out. Does anyone own a SP-8 speaker
>that can measure the dimensions of the inductors on the filter board? I'm
>trying to make an audio filter and was wondering whether they are the
>Allied Component RDC20 or RDC30. Thanks!
>
>Jason Bowen, KB5VXX
>______________________________________________________________
>1000mp mailing list
>Home: http://mailman.qth.net/mailman/listinfo/1000mp
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>
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>Please help support this email list: http://www.qsl.net/donate.html

From jimsmith at shaw.ca  Mon Mar 20 14:14:32 2023
From: jimsmith at shaw.ca (Jim Smith)
Date: Mon, 20 Mar 2023 12:14:32 -0600 (MDT)
Subject: [1000mp] SP8 owners question can someone measure the inductors?
In-Reply-To: <CAL4Fa0PuTphHc4oobMsyk-YySQsWCMGq5zvQnnLd_UNi5P4ZKg@mail.gmail.com>
References: <CAL4Fa0PuTphHc4oobMsyk-YySQsWCMGq5zvQnnLd_UNi5P4ZKg@mail.gmail.com>
Message-ID: <918946430.29483155.1679336072866.JavaMail.zimbra@shaw.ca>

Hello,

My father, Jim Smith VE7FO, passed away in November. Could you update your distribution list accordingly?

jimsmith at shaw.ca

I am keeping his email address active for the time being.

thanks,
Tracy Cochrane

----- Original Message -----
From: "J Bowen" <sydbowen at gmail.com>
To: 1000mp at mailman.qth.net
Sent: Wednesday, March 15, 2023 6:30:48 AM
Subject: [1000mp] SP8 owners question can someone measure the inductors?

Hey, I'm trying to figure something out. Does anyone own a SP-8 speaker
that can measure the dimensions of the inductors on the filter board? I'm
trying to make an audio filter and was wondering whether they are the
Allied Component RDC20 or RDC30. Thanks!

Jason Bowen, KB5VXX
______________________________________________________________
1000mp mailing list
Home: http://mailman.qth.net/mailman/listinfo/1000mp
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:1000mp at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html