>I have a grey toroid marked 34 am 55206 - a2 +2, outside dia .75, inside
>dia 9/16".
>From the ARRL handbook, it looks like it might be a T-80-3 ???
>Are the color codes standard for toroids?
>Is there a color code for ferrite toroid mix types?
To my knowledge, there's no standard color coding for ferrites. Most are
unpainted, so are the gray color of the ferrite itself. Others are painted.
I've seen gray-painted cores which are ferrite and others which are low-
frequency powdered iron. I'm assuming yours is painted, so I don't know
of any way to determine what it is except by putting a small number of
turns on the core and measuring its impedance at a number of frequencies.
If you have one you can sacrifice, you can break it. (Wear safety glasses.)
Ferrite breaks like glass, while powdered iron doesn't. If it's ferrite,
you can get a general idea of the type by measuring the DC resistivity of
the core. (High-freq. ferrites have high resistivity, low-freq. ferrites
have relatively low resistivity.) All powdered-iron cores I'm familiar with
look like insulators at DC.
The powdered-iron cores made by Micrometals (and sold by Amidon and others)
do have a standard color code, but other cores may resemble them.
73,
Roy Lewallen, W7EL
roy.lewallen@tek.com
------------------------------
Date: Wed, 12 Oct 1994 06:09:27 GMT
From: wrt@eskimo.com (Bill Turner)
Subject: INDUCTANCE MEASURING
In article <pelt-0710941337220001@box185.ams.vt.edu>,
Ranson J. Pelt <pelt@vt.edu> wrote:
>QST
>
>Can anyone give me some advice on a good piece of equipment for
measuring
>inductances. I have an LCR meter (LCR 195) which I purchased from
Alpha
>Elec. several years ago. This meter works great for measuring
capacitance
>but just doesn't get it for measuring small inductances (uh range).
>
>Tnx for the help.
>
>de nz4i Randy
>
>--
>Ranson Pelt
>pelt@vt.edu
>QST de nz4i
For inductances in the range of .1 to 300 uHy, an old Tektronix model
130 is hard to beat, but also hard to find. They have been out of
production for years, but they show up from time to time. I finally
found one last year at a hamfest for $40 in perfect working order.
Would've paid two or three times that much if I had to. Great 'ol
timer.
73, W7LZP
------------------------------
Date: Thu, 13 Oct 1994 18:18:21 GMT
From: duncanfj@eplrx7.es.duPont.com (Jeff Duncan)
Subject: Kenwood TS680/140 Computer Interface
hbrown@nadir.resd (Harry H. Brown) writes:
Call QSO Software
Call QSO Software at 1800 GUD DX 73 They have both an interface clone and
the software for IBM or Macintosh. 1800 483-3973.
>I've got a Kenwood TS680 transceiver that I would like to connect to a PC. My manual indicates that there is one but since this transceiver is no longer made, I'm looking for a used unit or a HB one. I'm also looking for MS DOS software for use with it. Does anyone have circuit info or know where I can find it (including control software)?
