Today's Message Index:
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1. 05:15 AM - Re: VM1000 backlighting dimming (Robert L. Nuckolls, III)
2. 08:41 AM - Inexpensive VOR diplexer ()
3. 10:12 AM - Re: Inexpensive VOR diplexer (Ron Quillin)
4. 11:24 AM - Oops - SD8 Regulator (John Morgensen)
5. 01:50 PM - Re: Inexpensive VOR diplexer ()
6. 02:43 PM - Re: Inexpensive VOR diplexer (Ron Quillin)
7. 04:37 PM - Re: Inexpensive VOR diplexer ()
8. 09:25 PM - Re: Inexpensive VOR diplexer (Don)
Message 1
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Subject: | Re: VM1000 backlighting dimming |
I've got the exact same problem with my older VM-1000 using a B&C
dimmer. I rarely fly at night, so fixing the problem has not been a
priority. It seems that when I first installed the devices, it worked
as advertised with plenty of night lighting. On a recent night
flight, however, the VM 1000 was too dim to use. At some point, I
added another device to the dimmer that supports the VM-1000. I have
supposed that the additional current draw caused the problem, but as
stated, I haven't taken any steps to correct.
The first thing to do is get MEASUREMENTS
as to how much voltage is being applied to
the VM1000 dimming input. Combine this with
an experiment to bypass any existing dimmer
and apply full bus voltage.
Up until recently, the VM-1000 has been supported by an outfit here
in San Antonio (Boerne Stage Airport.) Thanks to my weak memory, I
can't remember the name of the new outfit or the new owner, but I
remember their exact location and I still have their phone number.
They were very helpful a couple of years back when I first flew and
helped me get a different CPU chip for the higher fuel pressure
reading my AFP fuel injection required. I haven't talked to them in a
couple of years, but assume they are still in operation. Their phone
number is (was) 1-830-755-6330. I'll check further to see if they are
still in operation and if they have any suggestions for the dimming problem.
They should suggest the same sort of
investigation and experiments to determine
if there is a VM1000 problem or and externally
induced power supply issue.
When we did the DIM series devices now sold
by B&C, the design goals concentrated on how
a dimmer is used the vast majority of the
time.
When flying in a max dark adjusted condition,
one's visual acuity for seeing things outside
was best if lights inside were just barely
bright enough to read the instruments. Typically
4 or 5 volts on 12 v incandescent lamps. The
short interval that the lamps could use a
full-bright voltage supply was during twilight.
The only time pilots wished such lights were
brighter might be during thunderstorms. The B-52s
I worked on in '61 had "thunderstorm lights." Sealed
beam lamps above the pilot's heads on both
sides. Lightning flashes tended to blind the
crew so it was then useful to have some really
robust flood lighting! I tend to stay away from
thunderstorms . . . they're too loud.
Do the homework to see if the lighting problem
with the VM1000 is internal or externally
caused.
Bob . . .
Message 2
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Subject: | Inexpensive VOR diplexer |
I need to use one VOR antenna to server two VOR receivers. I'm guessing
the CATV job they sell at Home Depot won't work? Do any of you folks
make these or have an idea where to buy one of these without a mortgage?
Thanks,
Glenn Long
Message 3
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Subject: | Re: Inexpensive VOR diplexer |
At 08:34 1/7/2011, you wrote:
>I need to use one VOR antenna to server two VOR receivers. I'm guessing
>the CATV job they sell at Home Depot won't work? Do any of you folks
>make these or have an idea where to buy one of these without a mortgage?
>
>Thanks,
>
>Glenn Long
Well, there's this from minicircuits.com
http://minicircuits.com/cgi-bin/modelsearch?search_type=info&model=ZFSC-2-1W-75B%2B
for ~$50 that will do VOR & GS. Or others on eBay for ~$90...
Message 4
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Subject: | Oops - SD8 Regulator |
I managed to "kiss" the top of the big blue capacitor with a #30 drill.
It penetrated the black cardboard and I can see silver (Hopefully the
outside of the can).
Should I:
1. Test it somehow.
2. Pitch and replace.
3. Dab it with silicon and call it good.
?
John Morgensen
RV4 - Purchased flying
RV9A - Getting close.
Message 5
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Subject: | Inexpensive VOR diplexer |
Thanks,
Is 75 ohms correct for the Nav Splitter? I found a used job from an old
Cessna at DTW parts for $40.00. Do these things wear out?
Glenn E. Long
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ron
Quillin
Sent: Friday, January 07, 2011 1:08 PM
Subject: Re: AeroElectric-List: Inexpensive VOR diplexer
At 08:34 1/7/2011, you wrote:
I need to use one VOR antenna to server two VOR receivers. I'm guessing
the CATV job they sell at Home Depot won't work? Do any of you folks
make these or have an idea where to buy one of these without a mortgage?
Thanks,
Glenn Long
Well, there's this from minicircuits.com
http://minicircuits.com/cgi-bin/modelsearch?search_type=info&model=ZF
SC-
2-1W-75B%2B
for ~$50 that will do VOR & GS. Or others on eBay for ~$90...
Message 6
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Subject: | Inexpensive VOR diplexer |
At 13:47 1/7/2011, you wrote:
>Thanks,
>
>Is 75 ohms correct for the Nav Splitter?
No, it's not. Try a 50 ohm
<http://minicircuits.com/cgi-bin/buyitem?add=ZFSC%2d2%2d1%2b&back=>
ZFSC<http://minicircuits.com/cgi-bin/buyitem?add=ZFSC%2d2%2d1%2b&back=>-2-1+
for ~$45
Do you need GS? Upper NAV freq ~120MHz, but if you need GS you need
a splitter good to ~350MHz. Make sure the one you get has enough bandwidth.
> I found a used job from an old Cessna at DTW parts for $40.00. Do
> these things wear out?
They shouldn't if not abused, but I have seen bad ones that look fine.
Connectors tight, no corrosion, etc...
>Glenn E. Long
Message 7
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Subject: | Inexpensive VOR diplexer |
Thanks for the info Ron,
Do Not Archive
Glenn
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ron
Quillin
Sent: Friday, January 07, 2011 5:30 PM
Subject: RE: AeroElectric-List: Inexpensive VOR diplexer
At 13:47 1/7/2011, you wrote:
Thanks,
Is 75 ohms correct for the Nav Splitter?
No, it's not. Try a 50 ohm
<http://minicircuits.com/cgi-bin/buyitem?add=ZFSC%2d2%2d1%2b&back=>
ZFSC
<http://minicircuits.com/cgi-bin/buyitem?add=ZFSC%2d2%2d1%2b&back=>
-2-1+
<http://minicircuits.com/cgi-bin/buyitem?add=ZFSC%2d2%2d1%2b&back=>
for
~$45
Do you need GS? Upper NAV freq ~120MHz, but if you need GS you need a
splitter good to ~350MHz. Make sure the one you get has enough
bandwidth.
I found a used job from an old Cessna at DTW parts for $40.00. Do these
things wear out?
They shouldn't if not abused, but I have seen bad ones that look fine.
Connectors tight, no corrosion, etc...
Glenn E. Long
Message 8
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Subject: | Inexpensive VOR diplexer |
Glen, I have a used one that is good for VOR and Glide Slope. $50 and it is
yours.
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
longg@pjm.com
Sent: Friday, January 07, 2011 8:35 AM
Subject: AeroElectric-List: Inexpensive VOR diplexer
I need to use one VOR antenna to server two VOR receivers. I'm guessing
the CATV job they sell at Home Depot won't work? Do any of you folks
make these or have an idea where to buy one of these without a mortgage?
Thanks,
Glenn Long
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