Today's Message Index:
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1. 09:46 AM - Re: Re: iCom Antenna Switchbox effect on Com Radio (Robert L. Nuckolls, III)
2. 09:50 AM - Re: Re: iCom Antenna Switchbox effect on Com Radio (Robert L. Nuckolls, III)
3. 10:03 AM - Re: Re: iCom Antenna Switchbox effect on Com Radio (don van santen)
4. 10:09 AM - Re: Re: iCom Antenna Switchbox effect on Com Radio (Robert L. Nuckolls, III)
5. 12:27 PM - Earth-X bench battery (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: iCom Antenna Switchbox effect on Com |
Radio
At 03:32 PM 1/26/2017, you wrote:
>Some time ago when the MFJ-259 was mentioned in a post, I was
>wishing you had made a 'comic book' about it's proper use associated
>with aircraft testing. You were otherwise occupied at the time but
>thought it was a good idea to put on your to-do list. I would still
>appreciate your guidance since the included manual mentions several
>things NOT to do. Knowing how to do nondestructive testing would
>help. Thanks.
Good idea . . .
I'll put it in the 'bucket' of topics.
Bob . . .
Message 2
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| Subject: | Re: iCom Antenna Switchbox effect on Com Radio |
At 03:59 PM 1/26/2017, you wrote:
>I would imagine the MFJ-259 would be of limited application when
>testing at the transponder frequency, given it's normal application
>doesn't extend above VHF? I have the later MFJ-269, that does reach
>up into the lower part of UHF but only gives SWR results at that frequency.
Correct . . . I mentioned the MFJ259 as an
EXAMPLE of self excited network analyzer (read
SWR meter). At the same time, I was agreeing with
the comment that while the bare-foot VHF/UHF
analyzers can use the host comm transceiver as
a constant excitation source, a transponder offers
no such capability.
Bob . . .
Message 3
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| Subject: | Re: iCom Antenna Switchbox effect on Com Radio |
Please include nav antennas if possible. Thanks
On Jan 27, 2017 09:52, "Robert L. Nuckolls, III" <
nuckolls.bob@aeroelectric.com> wrote:
> At 03:32 PM 1/26/2017, you wrote:
>
> Some time ago when the MFJ-259 was mentioned in a post, I was wishing you
> had made a 'comic book' about it's proper use associated with aircraft
> testing. You were otherwise occupied at the time but thought it was a good
> idea to put on your to-do list. I would still appreciate your guidance
> since the included manual mentions several things NOT to do. Knowing how
> to do nondestructive testing would help. Thanks.
>
>
> Good idea . . .
>
> I'll put it in the 'bucket' of topics.
>
>
> Bob . . .
>
Message 4
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| Subject: | Re: iCom Antenna Switchbox effect on Com |
Radio
At 02:27 PM 1/26/2017, you wrote:
>
>I bought a lovely Agilent 8664A 100Mhz-3GHz signal generator on eBay
>a while back for about $800 - that would do the trick. Unfortunately
>it weighs 50lbs and getting down the stairs from the attic and out
>to the airport ramp would just about kill me.
Yeah, I own one of the 'cousins'
Emacs!
Got it off eBay about 12 years ago . . . it's
still working. I'm considering adding an
external, GPS disciplined reference oscillator.
Those are available now for under $200.
Not that it will add much . . . last time I
checked it against WWV it was still within
2 ppm after a 2 hour warm up. But with the
commercial two-way tolerances getting ever
tighter, being able to improve accuracy
by several orders of magnitude could
be handy.
I'm amazed at how good many of the jelly-bean
transceivers out of China are. I've helped
my fellow EMT crew acquire low cost (read
disposable) monitor radios. Out of 7 or 8
radios purchased so far, only one was more than
300 Hz off frequency at 453 Mhz.
Bob . . .
Message 5
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| Subject: | Earth-X bench battery |
About a year ago, Earht-X provided me a sample
ETX36 li-ion battery for evaluation. Over that
time I've had it installed in a couple of system
emulations . . . I've also cranked a few cars
with it.
Cap-Checking batteries and evaluating performance
of various battery maintenance tools can be about
as exciting as watching paint dry . . . so I keep
a rudimentary set of battery-tools on a table in
my office. Just for grins, I decided to cap-check
the sample ETX36.
I've conducted a couple of charge/discharge cycles
on the battery . . . want to do a couple more yet.
I'll share results when all the data is gathered.
A couple of recharge cycles were conducted with
a Battery Tender 'wall wart' maintainer . . . a tool
that's been in my stable for at least 10 years.
After each B-T recharge, the cap-check said the
test article was good for about 10.5 Ah. As I
recall, tests on the as-received sample produced
11.5 Ah cap-checks.
Here's the recharge plot on a Battery Tender.
Emacs!
Bob . . .
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