EMRFD Message Archive 8951
Message Date From Subject 8951 2013-08-12 17:27:37 Joe Re: LCR Meter (Steber LMS) While the AADE LCII works well with smaller capacitance and inductance
values, it is wanting at higher values.
A cheap test equipment addition/supplement/replacement to the AADE unit
is the LMS impedance bridge described by Dr. George Steber, WB9LVI. it
was described originally in Oct. 2005 QST, with a full blown treatment
in Sep/Oct 2005 QEX.
The QEX version may be found at:
The QST version may be found at:
The component count is low, requiring a dual OP Amp, LM358, 5 range
resistors which have been measured accurately, a 2 pole 5 throw switch,
some 1.5V batteries and a pair of 1/8" plugs and cables. Oh, and a Win98
or WinXP PC. A Linux/Wine combination should work as well.
Inductance range 13 uH to 130 H, capacitance range 13 pF to 1300 uF.
Once upon a time Dave, WB6DHW, offered a kit or bare board for this
project, but it seems to fallen by the wayside.
As with almost all programs written for Winxx by novice programmers, the
user interface has some quirks. In this case they are easily identified
[Non-text portions of this message have been removed]
8952 2013-08-12 17:34:53 Joe Re: LCR Meter (Steber LMS) The zipped executable for the program is still available at:
http://www.arrl.org/qexfiles expand year 2005
The required VB runtime s/b available from MicroSoft.
8953 2013-08-13 14:56:06 Lasse Moell OT: Trying to repair Bendix/King KX155 Sorry for posting OT, but I'm begging for help, not sure where to look!
I was asked by a local aircraft club if I could have a look at a non
working King KX155 radio. It appears to be a power supply issue. But as
I do not have any documentations what so ever I am really out on deep
water. If anyone have any experience on this type, I would love to hear.
Private mail may be the way to go, not to spam the list. This VHF-radio
seems to have been built in the late 80's and goes for fantasy prices on
E-bay... Even the service manual on E-bay cost more than what I consider
a fair price for the radio itself.
[Non-text portions of this message have been removed]
8954 2013-08-13 20:14:40 Roger Steyaert,K7... Re: OT: Trying to repair Bendix/King KX155 The KX155 is a very good certified general aviation nav com radio. It
should only be repaired by a certified shop or it can not be used in an
Roger Steyaert K7RXV
Retired avionics engineer.
8956 2013-08-14 07:17:59 Steven Re: OT: Trying to repair Bendix/King KX155 Yes it is a very Good Aviation Radio, and you would have to look up the Regs in the FAR's, but I am pretty sure as long as they are not putting it in a Certified Aircraft It would be good to go. They can always use it as a base stati 8957 2013-08-14 14:31:55 kb1gmx Re: OT: Trying to repair Bendix/King KX155 8958 2013-08-14 19:57:03 Lasse Moell Re: OT: Trying to repair Bendix/King KX155 Not sure what regs are over at our end... Pobably to be used in a
privately owned single engine plane at the local club, or maybe to stay
at the club house.
Even if I don't want to spend hours and hours try to figure out what
went wrong, I hate to waist good electronics... especially if it is
something easy to fix. It seems to be something deep in the power supply
given up, and not all components are easy to "decode". Still it seems
pretty straight forward, and the build quality reminds me of a HP
instrument from 70/80's.
Despite beeing a darn good aircraft TRX, it seems to use common
commercial components i.e. MC1350 in the IF and simple IF cans by TOKO.
But paying up to $1k for a non-working radio seems a bit over the top :)
On 14 aug 2013 15:03 "Steven" <firstname.lastname@example.org> wrote:
> Yes it is a very Good Aviation Radio, and you would have to look up
> the Regs in the FAR's, but I am pretty sure as long as they are not
> putting it in a Certified Aircraft It would be good to go. They can
> always use it as a base stati
8959 2013-08-14 19:57:05 Roger Steyaert,K7... Re: OT: Trying to repair Bendix/King KX155 That is not true. Instruments do not have to be certified but radios do
even for base station use as the can cause interference with certified
aircraft carrying passengers. This requirement is due to communications
rule not air regulations.
8960 2013-08-14 19:57:11 EricJ Re: OT: Trying to repair Bendix/King KX155 Since the poster is from Sweden, the FARs don't apply, but he should
check the regs of his own country. Or not...
8961 2013-08-14 19:57:13 Mark Bayern Re: OT: Trying to repair Bendix/King KX155 If it is to be used in the USA (note the call of the original poster) the
person who services it should hold a commercial license from the FCC. back
when I was servicing King radios it was either a First or Second Class
Radiotelephone License. Nowadays I believe it is the commercial General
Radio Operators License ... that is what they grandfathered all of us 1st
Phone holders to.
Mark AD5SS, GROL, GMDSS Maintainer
On Aug 14, 2013 9:18 AM, "Steven" <email@example.com> wrote:
> Yes it is a very Good Aviation Radio, and you would have to look up the
> Regs in the FAR's, but I am pretty sure as long as they are not putting it
> in a Certified Aircraft It would be good to go. They can always use it as
> a base stati
8962 2013-08-14 19:57:14 Lasse Moell Re: OT: Trying to repair Bendix/King KX155 Allison,
thanks for the info!
I've thrown in the towel... i.e. told the guy I would not put in more
time, unless somehow a manual magically do show up. Having no personal
interest in get this radio going, I rather spend my free time do things
that I need to fix here at home :)
On 14 aug 2013 23:31 "kb1gmx" <firstname.lastname@example.org> wrote:
8963 2013-08-15 06:34:40 dave Re: OT: Trying to repair Bendix/King KX155 Start by looking for any burnt or overheated parts in the power supply section, then check the filter capacitors and check the rectifier diodes.
8964 2013-08-15 07:08:36 Lasse Moell Re: OT: Trying to repair Bendix/King KX155 As one of my friends said to his wife-to-be years ago when teaching her the zen of tv repair; "Have you checked the voltages?"
I verified that it did supply voltage to regulator circuits, having input of 13,5 volt, and measuring 8,5 volt at collector on the TO3 PNP power transistor. Several unknown components surounding, and all capacitors look clean with no visual problems. Unit draws 0.4 Amps but shows no life. I assume there should be a high-voltage switched regulator for the display. As I never got round to dismember the unit deep enough to find good spots to measure voltage, the PS seems to be stuffed deep into the chassie, I simply folded all back and quietly gave up :(
I must admit it hurts badly not manage to find the fault (which probably is just a bad cap or semi) but as this is not my radio nor do I have any interest in aircrafts so I gave it an evening and thats it.
On 15 aug 2013 05:14 "dave" <email@example.com> wrote:
> Start by looking for any burnt or overheated parts in the power supply
> section, then check the filter capacitors and check the rectifier
> --- In firstname.lastname@example.org