Today's Message Index:
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0. 12:34 AM - A List Contribution - It's Your Personal Squelch Button... (Matt Dralle)
1. 03:26 PM - Re: lithium facts (Jan de Jong)
2. 04:10 PM - RS422 - RS232 (James Bean)
3. 05:01 PM - Re: RS422 - RS232 (Robert L. Nuckolls, III)
4. 05:07 PM - Re: RS422 - RS232 (Robert L. Nuckolls, III)
5. 11:18 PM - VOR Antenna / Balun / Lead (Chuck Birdsall)
Message 0
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| Subject: | A List Contribution - It's Your Personal Squelch Button... |
There is an automatic "squelch button" of sorts for the Fund Raiser messages.
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Message 1
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| Subject: | Re: lithium facts |
Interesting article concerning LiFePO4 and dynamic behaviour:
http://epg.eng.ox.ac.uk/sites/default/files/Howey/HEVC_IET_Birkl_Howey.pdf
An equivalent circuit was developed for an A123 APR18650 cell with 3
series elements:
a series resistance of a few tens of mOhm,
a time constant of a few seconds that resolves to a series resistance of
few mOhm,
a time constant of a few tens of seconds that resolves to a series
resistance of a few tens of mOhm
(there are extremes at high and low temperatures and high and low SOC)
Something to think about when designing a balancing algorithm.
A voltage observed a couple of seconds after the application of a shunt
cannot be compared directly to that voltage before the shunt application.
Estimating the final voltage (from slope and value at two moments )
would take tens of seconds...
Something else I would want to hear about from a supplier of batteries
with built-in BMS.
Jan de Jong
Message 2
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In starting to think about ADS-B one way to get out only would be a
Mode-S transponder hooked to the existing Garmin 432W. The 432 speaks
RS232 and the transponder slide in replacement speaks RS422. There are
converters available for under 20 bucks. Is it that simple?
Jim Bean
Message 3
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| Subject: | Re: RS422 - RS232 |
At 18:09 2014-11-10, you wrote:
>
>In starting to think about ADS-B one way to get out only would be a
>Mode-S transponder hooked to the existing Garmin 432W. The 432
>speaks RS232 and the transponder slide in replacement speaks RS422.
>There are converters available for under 20 bucks. Is it that simple?
Yeah pretty simple. I used to build them for
some applications in Beech's Targets Division.
Your best bet is just to buy one. See:
http://tinyurl.com/ly5hb9q
Bob . . .
Message 4
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| Subject: | Re: RS422 - RS232 |
At 18:09 2014-11-10, you wrote:
>
>In starting to think about ADS-B one way to get out only would be a
>Mode-S transponder hooked to the existing Garmin 432W. The 432
>speaks RS232 and the transponder slide in replacement speaks RS422.
>There are converters available for under 20 bucks. Is it that simple?
If you want to build on, here's a schematic.
[]
Bob . . .
Message 5
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| Subject: | VOR Antenna / Balun / Lead |
The VOR antenna balun setup on my 1972 Cherokee has come apart (age,
corrosion). Looks like RG-58 for the lead/balun. There's enough
corrosion on the antenna lead screws and elsewhere that has me thinking
about replacing the antenna. So, I have the following questions:
Is there any practical difference between antennas with a built-in balun
and a BNC connection (i.e. RAMI AV-525), and a VOR antenna with the
balun in the antenna lead (such as the RAMI AV-12)? (Other than cost
and having to spend a short amount of time making the balun ...)
Is there a perceptible difference between RG-58 and RG-400 for the
antenna lead? There's enough slack in the current antenna lead that I
could simply cut off the bad part of the old cable and install a BNC
connector... (but I'd still have 40+ year old cable.)
I do have a short (<10ft) length of RG-400 so I could try to replace the
bad section of the existing lead, make a new balun and try to rescue the
existing antenna from the oxidation. This would add two BNC connectors
in the antenna lead run. Properly done, would the connectors provide a
significant loss of signal? Or would I be better off to spend the $$
and buy enough RG400 to make the whole run?
Radios are 2x KX170B w/additional GS receiver, single 1-in / 3-out
splitter divides between them.
Thanks,
Chuck
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