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Forum: HDTV Technical   03-28-2015, 11:19 AM
Replies: 22
Views: 229
Posted By rabbit73
ADTech has posted an interesting thread showing...

ADTech has posted an interesting thread showing the damage that can be done by a preamp that is not needed. Note in the second spectrum analyzer image that the noise floor has been raised by the IMD...
Forum: HDTV Technical   03-28-2015, 10:58 AM
Replies: 22
Views: 229
Posted By rabbit73
Talk to their engineer by phone and email your...

Talk to their engineer by phone and email your tvfool report.

The bandstop filters that provide a lot of attenuation in the stopband usually have greater insertion loss in the passband which will...
Forum: HDTV Technical   03-28-2015, 10:14 AM
Replies: 22
Views: 229
Posted By rabbit73
Good idea; that's the type of meter I started...

Good idea; that's the type of meter I started with. Make sure you get one for VHF and UHF, called VU by Sadelco. The VS model covers VHF and Super Band (cable). Don't bid any more than you are...
Forum: HDTV Technical   03-28-2015, 08:18 AM
Replies: 8
Views: 126
Posted By rabbit73
Channel 20 is the REAL channel number that is...

Channel 20 is the REAL channel number that is used by the transmitter. Channel 67.1 is the VIRTUAL channel number, which is a carryover from analog TV days. There is no longer a channel 67 used by...
Forum: HDTV Technical   03-28-2015, 07:37 AM
Replies: 49
Views: 552
Posted By rabbit73
Back to your original problem: Does 8...

Back to your original problem:


Does 8 get any better if you aim your antenna 134 degrees magnetic?

How much gain does your antenna have on VHF-high?

You really do need a VHF-high...
Forum: HDTV Technical   03-28-2015, 07:18 AM
Replies: 49
Views: 552
Posted By rabbit73
I think I've got it; thanks.

I think I've got it; thanks.
Forum: HDTV Technical   03-27-2015, 06:26 PM
Replies: 49
Views: 552
Posted By rabbit73
When I click on Inspect element I see iframe at...

When I click on Inspect element I see iframe at bottom
Forum: HDTV Technical   03-27-2015, 06:03 PM
Replies: 49
Views: 552
Posted By rabbit73
Doesn't seem to work in IE11

Doesn't seem to work in IE11
Forum: HDTV Technical   03-27-2015, 05:12 PM
Replies: 22
Views: 229
Posted By rabbit73
It should be a variable attenuator with one dB...

It should be a variable attenuator with one dB steps. It should be between the antenna and the preamp input because the spurious signals that are a product of intermodulation distortion, that damage...
Forum: HDTV Technical   03-27-2015, 04:52 PM
Replies: 22
Views: 229
Posted By rabbit73
It isn't easy to tune them if you can still find...

It isn't easy to tune them if you can still find them. The Tin Lee filters come pre-tuned.
http://www.tinlee.com/Matv_filters.php (http://www.tinlee.com/Matv_filters.php)...
Forum: HDTV Technical   03-27-2015, 04:37 PM
Replies: 22
Views: 229
Posted By rabbit73
The attenuator before the preamp method that I...

The attenuator before the preamp method that I have tested is the best way to optimize a reception setup at any particular location.
Forum: HDTV Technical   03-27-2015, 03:45 PM
Replies: 22
Views: 229
Posted By rabbit73
It's important that the coax shield is grounded...

It's important that the coax shield is grounded to keep those strong signals from getting into the TV when the coax is connected.
http://www.digitalhome.ca/forum/showpost.php?p=1303730&postcount=126...
Forum: HDTV Technical   03-27-2015, 03:31 PM
Replies: 49
Views: 552
Posted By rabbit73
Very interesting; I've never seen a report in...

Very interesting; I've never seen a report in that form.
What button do I click to generate that type of report?
Forum: HDTV Technical   03-27-2015, 01:53 PM
Replies: 22
Views: 229
Posted By rabbit73
WDLI-TV NM 83.1 dB WIVM-LD NM 11 dB 83.1 - 11...

WDLI-TV NM 83.1 dB
WIVM-LD NM 11 dB
83.1 - 11 = 72.1 dB
72.1 +16 dB for WIVM min required SNR = 88.1 dB SFDR needed
Not gonna happen; you need to attenuate your three strongest signals like...
Forum: HDTV Technical   03-27-2015, 01:27 PM
Replies: 22
Views: 229
Posted By rabbit73
With such strong signals, why are you worried...

With such strong signals, why are you worried about the losses?
Are there some weak signals that you want? Which ones?
If that is so, you need to attenuate your 3 strongest signals to reduce the...
Forum: HDTV Technical   03-27-2015, 01:09 PM
Replies: 49
Views: 552
Posted By rabbit73
You cut off too much. Try again. When I...

You cut off too much. Try again.

When I tried to reconstruct the link I didn't get a report, I got the Online Coverage Map Browser:...
Forum: HDTV Technical   03-27-2015, 11:42 AM
Replies: 49
Views: 552
Posted By rabbit73
Does this look right? ...

Does this look right?

http://www.tvfool.com/?option=com_wrapper&Itemid=29&q=id%3d2c15b495168fb8

Try this:
Backspace to erase fb8 and retype them.

The new forum software isn't user...
Forum: HDTV Technical   03-27-2015, 11:02 AM
Replies: 8
Views: 126
Posted By rabbit73
KFXV-LD and KXFX-CA are both on real channel 20,...

KFXV-LD and KXFX-CA are both on real channel 20, so you might have a co-channel interference problem.
http://www.rabbitears.info/market.php?request=station_search&callsign=kxfx-ca...
Forum: HDTV Technical   03-25-2015, 05:44 PM
Replies: 9
Views: 182
Posted By rabbit73
I was wondering how strong your local FM signals...

I was wondering how strong your local FM signals were, to see if they might cause interference to your TV reception. It looks like most of your strong FM signals are from the southern hemisphere of...
Forum: HDTV Technical   03-25-2015, 01:26 PM
Replies: 9
Views: 182
Posted By rabbit73
5.4.2 Adjacent Channel Rejection The receiver...

5.4.2 Adjacent Channel Rejection
The receiver should meet or exceed the thresholds given in Table 5.2 for rejection of first
adjacent-channel interference at the desired signal levels shown above...
Forum: HDTV Technical   03-25-2015, 11:46 AM
Replies: 9
Views: 182
Posted By rabbit73
http://www.atechfabrication.com/products/x300-db_i...

http://www.atechfabrication.com/products/x300-db_integrated_stacking_boom.htm (http://www.atechfabrication.com/products/x300-db_integrated_stacking_boom.htm)
...
Forum: HDTV Technical   03-24-2015, 01:40 PM
Replies: 28
Views: 542
Posted By rabbit73
sorry, redo of post 20 The new software on this...

sorry, redo of post 20
The new software on this forum is not user friendly.
The AntennaCraft HBU-22 is in short supply. If you take holl_ands advice and mount it at a convenient height, aim it at...
Forum: HDTV Technical   03-24-2015, 12:07 PM
Replies: 28
Views: 542
Posted By rabbit73
The AntennaCraft HBU-22 is in short supply and...

The AntennaCraft HBU-22 is in short supply and getting hard to find. If you take holl_ands advice and mount that antenna at a convenient height, aim it at 319 degrees magnetic, and run a new RG6 coax...
Forum: HDTV Technical   03-21-2015, 05:51 PM
Replies: 10
Views: 294
Posted By rabbit73
The April 2015 QST Magazine has an interesting...

The April 2015 QST Magazine has an interesting article on this topic:

Microwavelengths Column

Dynamic Range
Gauging your receiver's weak-signal sensitivity in a strong-signal environment.
...
Forum: HDTV Technical   03-21-2015, 01:53 PM
Replies: 51
Views: 1,837
Posted By rabbit73
I'm not comfortable with S-Parameters either. ...

I'm not comfortable with S-Parameters either.

Thanks Chuck.

http://www.antenna-theory.com/definitions/sparameters.php (http://www.antenna-theory.com/definitions/sparameters.php)...
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