Today's Message Index:
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0. 12:10 AM - PLEASE READ - Matronics Email List Fund Raiser During November! (Matt Dralle)
1. 06:57 AM - Re: Re: vhf transponder interference (Robert L. Nuckolls, III)
2. 12:38 PM - Bench power supply (Robert L. Nuckolls, III)
3. 12:57 PM - Re: Bench power supply (Daniel Hooper)
4. 01:05 PM - Re: Bench power supply (Robert Borger)
5. 01:18 PM - Re: vhf transponder interference (jappie)
6. 01:19 PM - Re: Bench power supply (Robert L. Nuckolls, III)
7. 02:26 PM - Re: Re: vhf transponder interference (Robert L. Nuckolls, III)
8. 02:50 PM - Walmart battery charger. (Robert L. Nuckolls, III)
9. 04:06 PM - Re: Walmart battery charger. (James Robinson)
10. 04:57 PM - 912iS paper (Jan de Jong)
Message 0
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Subject: | PLEASE READ - Matronics Email List Fund Raiser During |
November!
Dear Listers,
Each November I hold a PBS-like fund raiser to support the continued operation
and upgrade of the Email List and Fourm Services at Matronics. It's through solely
through the Contributions of List members that these Matronics Lists are
possible.
You have probably noticed that there are no banner ads or pop-up windows on any of the Matronics Lists or related web sites such as the Forums site http://forums.matronics.com , Wiki site http://wiki.matronics.com , or other related pages such as the List Search Engine http://www.matronics.com/search , List Browse http://www.matronics.com/listbrowse , etc. This is because I believe in a List experience that is completely about the sport we all enjoy - namely Airplanes and not about annoying advertisements.
During the month of November I will be sending out List messages every couple of
days reminding everyone that the Fund Raiser is underway. I ask for your patience
and understanding during the Fund Raiser and throughout these regular messages.
The Fund Raiser is only financial support mechanism I have to pay all
of the bills associated with running these lists. Your personal Contribution
counts!
Once again, this year I've got a terrific line up of free gifts to go along with
the various Contribution levels. Most all of these gifts have been provided
by some of the vary members and vendors that you'll find on Matronics Lists and
have been either donated or provided at substantially discounted rates.
This year, these generous people include:
Bob Nuckolls of the AeroElectric Connection http://www.aeroelectric.com
Andy Gold of the Builder's Bookstore http://www.buildersbooks.com
Jon Croke of HomebuiltHELP http://www.homebuilthelp.com
These are very generous guys and I encourage you to visit their respective web
sites. Each one offers a unique and very useful aviation-related product line.
I would like publicly to thank Bob, Andy, and Jon for their generous support
of the Lists again this year!!
Please make your List Contribution using any one of three secure methods including
using a credit card, PayPal, or by personal check. All three methods afford
you the opportunity to select one of this year's free gifts with a qualifying
Contribution amount!!
To make your Contribution, please visit the secure site:
http://www.matronics.com/contribution
I would like to thank everyone in advance for their generous financial AND moral
support over the years!
Thank you for your support!
Matt Dralle
Matronics Email List Administrator
RV-4/RV-6/RV-8 Builder/Rebuilder/Pilot
Message 1
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Subject: | Re: vhf transponder interference |
At 04:52 PM 10/31/2012, you wrote:
>
>thank you Bob
>
>I've also found on "Google" that I should have a Notch filter
>installed, as per Garmin, which I don't have....
>
>I bought the plane 9 years ago as is....
>
>I will check the coax cable during winter maintenance.
>
>JP
>
Can you point me to the website that recommends/offers
this 'notch filter'?
Bob . . .
Message 2
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Subject: | Bench power supply |
Still digging through moving boxes . . .
Ran across a power supply I bought a few years ago
for a client project. This was a second supply kept
on hand as a spare.
http://tinyurl.com/abhch37
This critter is still in the original plastic bag.
That project has long since been put to bed so I'm
offering it first to List members for $100 priority
mail postage paid to US address.
If nobody wants it, I'll put it up on eBay in a week
or so . . . earliest 'postmark' takes it.
Bob . . .
Message 3
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Subject: | Re: Bench power supply |
That would be great for my lab. Does it do 10A all the way to 30V?
--Daniel
On Nov 1, 2012, at 2:37 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
>
> Still digging through moving boxes . . .
>
> Ran across a power supply I bought a few years ago
> for a client project. This was a second supply kept
> on hand as a spare.
>
> http://tinyurl.com/abhch37
>
> This critter is still in the original plastic bag.
>
> That project has long since been put to bed so I'm
> offering it first to List members for $100 priority
> mail postage paid to US address.
>
> If nobody wants it, I'll put it up on eBay in a week
> or so . . . earliest 'postmark' takes it.
>
>
>
> Bob . . .
>
>
>
>
Message 4
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Subject: | Re: Bench power supply |
Bob,
I'll take it off your hands. Should I send a check?
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Nov 1, 2012, at 2:37 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
Still digging through moving boxes . . .
Ran across a power supply I bought a few years ago
for a client project. This was a second supply kept
on hand as a spare.
http://tinyurl.com/abhch37
This critter is still in the original plastic bag.
That project has long since been put to bed so I'm
offering it first to List members for $100 priority
mail postage paid to US address.
If nobody wants it, I'll put it up on eBay in a week
or so . . . earliest 'postmark' takes it.
Bob . . .
Message 5
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Subject: | Re: vhf transponder interference |
This is a .pdf file: installation manual for Garmin 250 XL
page 9 & 10 Notch filter required, but I understand that it if for GPS interference,
not my problem, but still say I need it anyway.
JP
http://trackeraff.com/IAS/manuals/Garmin/GNC%20250/156_InstallationManual.pdf
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=386519#386519
Message 6
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Subject: | Re: Bench power supply |
At 03:04 PM 11/1/2012, you wrote:
>
>Bob,
>
>I'll take it off your hands. Should I send a check?
Thanks!
I've sent you a PayPal invoice
Bob . . .
Message 7
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Subject: | Re: vhf transponder interference |
At 03:18 PM 11/1/2012, you wrote:
>
>This is a .pdf file: installation manual for Garmin 250 XL
>
>page 9 & 10 Notch filter required, but I understand that it if for
>GPS interference, not my problem, but still say I need it anyway.
>
>JP
Okay. The GPS signal radiated by satellites is VERY
small. At the same time, your VHF transmitter is designed
to transmit most strongly in the 118 to 135 range, a range
that brackets 131.285. The 12th harmonic of this frequency
falls on the GPS center frequency of 1.57542 Ghz.
A check you can make first is to see how transmissions
on frequence adjacent to the 'rosewood stake' affects
GPS performance. Watch GPS signal strengths while keying
the transmitter on say on all the notches between 131.2
and 131.35. See if the signal strengths degrade to causing
the GPS to loose track.
If so, try the VHF comm frequencies down to day 131 and up
to 132 . . . how close CAN you be to the rosewood stake and
not affect the GPS.
Then count how many times you've used frequencies in that
range and further, asses the risk to comfortable conduct
of the flight if you DO happen to whack the GPS signal
on occasion.
I've flown a lot of GPS aided miles and never noticed
a loss of nav data event. Even if it had occurred, I might
not have noticed it. I think it's a good thing to be
aware of . . . and watch for . . . but not sure it's worth
the price of this notch filter. That assumes that it costs
more than $0.50 and the top off a box of Wheaties.
If you find that you don't have noteworthy interference,
let us know what you find. I've been aware of the potential
for this issue but I can't recall it rising up in conversations
at HBC. Wayyyyy back when, we had some problems with
signals radiated from the RECEIVER oscillators interfering
with GPS. That required fabrication of a shield screen to
stack between the two radios.
Bob . . .
Message 8
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Subject: | Walmart battery charger. |
At 04:39 PM 10/31/2012, you wrote:
>Hi Bob
>Is the small Walmart battery tender a good deal. It is quite a bit
>less expensive than the battery tender brand, Your opinion?
>Jim Robinson
As Neal notes, the one we've discussed her on the
List (Schumacher 1562) is a great performer. I've
got two of them. For $20 the value is inarguable.
Bob . . .
Message 9
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Subject: | Re: Walmart battery charger. |
Thanks Bob
Sent from my iPad
On Nov 1, 2012, at 4:49 PM, "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
wrote:
>
> At 04:39 PM 10/31/2012, you wrote:
>> Hi Bob
>> Is the small Walmart battery tender a good deal. It is quite a bit less expensive
than the battery tender brand, Your opinion?
>> Jim Robinson
>
>
>
> As Neal notes, the one we've discussed her on the
> List (Schumacher 1562) is a great performer. I've
> got two of them. For $20 the value is inarguable.
>
>
>
> Bob . . .
>
>
>
>
Message 10
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(copied from RotaxEngines list)
Those interested in the design of the 912iS may want to buy SAE paper nr
2012-32-0049.
By 3 Rotax engineers and recently presented at an SAE conference.
It costs $23 and can only be printed, during 24 hours, not saved.
Some of the figures need to be printed separately to make some very
small print readable (primitive but working procedure: zoom to maximise
on screen, copy screen to clipboard, paste into picture viewer like
Irfanview, crop in picture viewer and print/save).
I found it interesting. A lot of questions were answered, quite a few
remain.
Jan de Jong
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