Larry, thanks for the detailed explanation of how DTV deals with
multipath interference. While watching TV last night, I discovered
that removing the power injector from the system resulted in
significantly better digital "continuity", and less snow type noise on
VHF analog.

This makes me think that there is a problem in this particular unit.
I am tempted to open it up and see what I can see. The appeal of not
shipping it back to the online seller ( they charged $16 for UPS
ground) is quite tempting. I may screw it up, will certainly void the
warranty, but may find a mechanical problem that I can fix. I am
going to AB the winegard in passive mode and the homebrew loop to see
which is better.

The FCC's spectrum auctions are of interest to me as a live sound
engineer. Wireless mics are in a state of flux with heavy use in the
700Mhz band before the recent changes. Lots of users are very vexed
with this, but as an industry, we have very little clout compared to
cellular and broadband providers.

Larryr wrote in news:8c1cb3a9-523c-4901-b0e9-
:

The FCC's spectrum auctions are of interest to me as a live sound
engineer. Wireless mics are in a state of flux with heavy use in the
700Mhz band before the recent changes. Lots of users are very vexed
with this, but as an industry, we have very little clout compared to
cellular and broadband providers.



I work on PA systems in churches. Channel 7 TV on 174 eliminates those
mics in that band 100%. That transmitter will shut down soon, relieving
lots of problems their video sidebands have caused all these years.

Of all places, Radio Shack came out with some really nice, and cheap,
900 Mhz handheld and lapel/beltclip wireless mics that work simply
wonderful! They are all channel selectable over 8 channels on 900 Mhz.
I've never heard a single odd noise or had any reports of any odd
signals breaking their squelch. With all 8 receivers stacked under the
pulpit at the back of the auditorium, antennas helter skelter wherever
they'll fit, I can take a hand mic off the stage, down any aisle, out
the back doors into the church vestibule, out the thick front door of
this huge masonry church that seats 1100, down the 18 front steps into
the street, across the street and halfway down the neighbor's driveway
across the street from the church before the signal starts to break up!
They've got to be the hottest wireless mics under $150 I've ever seen.
The same church has another mic they paid over $600 for on the 450 Mhz
spectrum that can't go to the back of the big church without balking.
And, crazy as it is, the cheap RS mics SOUND BETTER! The handheld costs
about $80 so if someone breaks it there's not so many tears shed as with
one costing $350.

Now, if I could only teach AME preachers how NOT to put the damned 9V
transistor battery in UPSIDE DOWN with BOTH battery contacts shorting
out against the BIG METAL SPRING holding the battery in
place!....Grrrrr....(expletives deleted).

"Come fix this mic. It went dead and even a new battery didn't fix it."

"See the nice diagram I pasted to the box you store them in? Notice how
these contacts on the battery fit SO NEATLY into these two little SLOTS,
ONE BIG and one little so you can't get them in reversed? Notice how
the battery that melted has BOTH contacts shorting against the metal
clip on the OPPOSITE END from where the two slots are?!"

I try to stay calm.....They keep writing the checks.....(c;]

What do you charge for putting batteries into microphones 25 miles away?

On Dec 28, 10:26*am, Larry wrote:

Of all places, Radio Shack came out with some really nice, and cheap,
900 Mhz handheld and lapel/beltclip wireless mics that work simply
wonderful! *They are all channel selectable over 8 channels on 900 Mhz. *
I've never heard a single odd noise or had any reports of any odd
signals breaking their squelch.

I have a hard time trusting radio shack to build durability into
micronta products. After i blew up a fluke 77 looking at a microwave
(idiot move) I replaced it with a top of the line micronta DMM. The
on off switch failed within a month, after I had left the US under
sail and couldn't return it. I suspect that in the long run, even if
the RS mics sound decent, the companders are not up to real pro
standards and the durability is probably iffy at best.

Now, if I could only teach AME preachers how NOT to put the damned 9V
transistor battery in UPSIDE DOWN with BOTH battery contacts shorting
out against the BIG METAL SPRING holding the battery in
place!....Grrrrr....(expletives deleted).

"Come fix this mic. *It went dead and even a new battery didn't fix it."

"See the nice diagram I pasted to the box you store them in? *Notice how
these contacts on the battery fit SO NEATLY into these two little SLOTS,
ONE BIG and one little so you can't get them in reversed? *Notice how
the battery that melted has BOTH contacts shorting against the metal
clip on the OPPOSITE END from where the two slots are?!"

I try to stay calm.....They keep writing the checks.....(c;]

What do you charge for putting batteries into microphones 25 miles away?

The more you charge for such a service call, the more likely the users
will educate themselves to prevent future expense!!!

On Sun, 28 Dec 2008 07:44:19 -0800 (PST), Larryr
wrote in
:

On Dec 28, 10:26*am, Larry wrote:

Of all places, Radio Shack came out with some really nice, and cheap,
900 Mhz handheld and lapel/beltclip wireless mics that work simply
wonderful! *They are all channel selectable over 8 channels on 900 Mhz. *
I've never heard a single odd noise or had any reports of any odd
signals breaking their squelch.

I have a hard time trusting radio shack to build durability into
micronta products. ...

Radio Shack doesn't build them. They are sourced from multiple Asian
contract manufacturers.

--
Very best wishes for the holiday season and for the coming new year,
John

John Navas wrote in
:

Radio Shack doesn't build them. They are sourced from multiple Asian
contract manufacturers.


I knew that. I think Uniden, the CB maker, made these....

On Dec 28, 7:20*pm, Larry wrote:
John Navas wrote :

Radio Shack doesn't build them. *They are sourced from multiple Asian
contract manufacturers.

I knew that. *I think Uniden, the CB maker, made these....

Radio Shack does specify what they want in a product. Some are just
rebranded like the radio shack SM-58 look alikes that have shure
written on the xlr insert. Of course they are 58's that didn't meet
quality control specs for shure...

If radio shack buys tens of thousands of a unit, they damn well can
(but may not) demand robustness in design.They didn't in feature laden
DMM's that fail if you sneeze hard on them.

Larryr wrote in
:

On Dec 28, 7:20*pm, Larry wrote:
John Navas wrote
innews:vi8fl4dvq9el9saob1hj
:

Radio Shack doesn't build them. *They are sourced from multiple
Asian contract manufacturers.

I knew that. *I think Uniden, the CB maker, made these....

Radio Shack does specify what they want in a product. Some are just
rebranded like the radio shack SM-58 look alikes that have shure
written on the xlr insert. Of course they are 58's that didn't meet
quality control specs for shure...

If radio shack buys tens of thousands of a unit, they damn well can
(but may not) demand robustness in design.They didn't in feature laden
DMM's that fail if you sneeze hard on them.


One of the lapel mics failed a couple of months ago. They had plenty of
spares so didn't hand it to me until I was working on the antique Allen
electronic pipe organ that dates back to the very first point-contact
germanium transistors it is full of....one oscillator transistor for
each note it plays...a hartley oscillator with tapped coil for
stability.

Someone forgot to turn off the preamp in the mic and the button watch
battery in the tiny box was dead. I can't believe how long those things
will run or how much abuse they'll take swingin' and swayin' to the
screaming music every Sunday. They all must be deaf. I even have to
replace mid range speakers!

I buy DMMs, in bulk, from Harbor Freight. At $3.99, they're worth it
even if you toss the whole DMM in the trash just for the nice little
test leads that are nicer than RatShacks and half the price with a full
featured DMM with batteries attached! I keep a dozen or so to hand out
to aspiring young technicians and engineers I may need a hand from 10
years from now....mostly to get out of my wheelchair, probably. Give a
curious kid a little DMM and you can ruin his whole life! Serves them
right....it did me.
http://www.youtube.com/watch?v=r9CxjvIAJqc

http://www.harborfreight.com/cpi/cta...emnumber=90899
Darn, they went up a buck!

At $20, this is my favorite DMM:
http://www.harborfreight.com/cpi/cta...emnumber=37772

While were here, every boat should have this 100A battery tester:
http://www.harborfreight.com/cpi/cta...emnumber=90636
It's only $15 and will snoop out those dead cells in 2 minutes flat!

I held my breath and bought the Big Kahuna of battery/alternator
testers:
http://www.harborfreight.com/cpi/cta...emnumber=91129
Wanna see how much power you can get before the belt starts slippin'?
Dis be the beast! 500 amps. If you're going to try for more than a
hundred amps....make damned sure the clamps dig INTO the posts real hard
or this carbon pile load will really smoke them!

It never ceases to amaze me, an old metrologist (calibration technician
USN) how ACCURATE even the cheapest Chinese analog volt or ammeter is
calibrated. It's uncanny! Those little analog VOMs from Ratshack are
DEAD ACCURATE!