6M Activity?

[Bob Macklin]

Next year when the TV stains shut down their analog stations does 6M become
free from TVI?

Will this stimulate the interest in 6M activity?

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"

[KJ6KO]

CH2 will be no more, so...possibly. Problem is, all those mast mount
broadband TV amps will still get killed!

[Loren Moline WA7SKT]

Won't the channels still be transmitting except in digital form?

Loren   WA7SKT
 
Member: ARRL and Pacific Northwest VHF Society
Location: CN86cx                                                                                       

[KJ6KO]

No, the FCC will auction off the spectrum!  I've heard AT&T has a HUGE amount of money set aside for that spectrum!!  Why?

[WB7RSG]

Yes, but...... it will be far more difficult for "Joe Six-pack" to
figure out that it's "that damn radio guy down the street" interfering
with his digital TV receiver. The picture will just go away for a
while sometimes, it won't bounce around in step with SSB or CW
signals, and unless you're close enough to hammer the TV's audio
circuit, nothing resembling Donald Duck will come from the speaker.

I've been told that the "low band" VHF TV channels will be abandoned
entirely, so everything below channel 7 will be going to UHF..... Is
this true? What service will be taking up the empty channels? 30 MHz
of VHF bandwidth would be a juicy thing for somebody.

73 DE WB7RSG

Greg Daly

[Barry Garratt]

Actually quite a few low band stations are staying on and some are even moving to CH 2. Case in point the local CH 3 analog here in Las Vegas is moving to CH 2 digital.

 

Low powers and class A stations will still remain as well. There is no mandatory digital date set for these stations yet.

 

Barry VE3CDX/W7 DM26ic

---

From: PNW...@googlegroups.com [mailto:PNW...@googlegroups.com] On Behalf Of KJ6KO
Sent: Tuesday, May 27, 2008 8:58 AM
To: pnw...@googlegroups.com

[Bill W5WVO]

Interesting thread (or beginning of), but I think half the contributors are talking about TVI caused by 6 meter operation to TV sets, and the other half are talking about TVI caused by TV transmitters to 6 meter receivers. I would like to address the latter concern.

 

Like many hams, I live within line of sight (10 miles) of a broadcast mountaintop that includes a channel 2 and a channel 4 transmitter, not to mention various other high-power TV and FM transmitters. The 15 kHz sync mixes coming off the mountain happen to fall squarely on 50110, 50125, and 50140, making these key frequencies virtually unusable when pointing (for me) anywhere in the southeast quadrant. I'm wondering how much of this trash I can expect to go away when (if) the analog TV transmitters up there all disappear?

 

I don't know what the plans are for the various stations represented on top of the mountain, and I'm not really sure where to find this information. Is there an FCC web page that will tell me what specific stations are going to be doing come February?

 

Bill W5WVO

[Bob Macklin]

It's confusing to me. http://www.dtv.gov/consumercorner.html

This say that stations are transmitting in both modes now. On the same
frequencies?

I have also heard that the low TV channel frequencies are also going to be
reassigned.

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"

----- Original Message -----
From: "WB7RSG" <gpd...@gmail.com>
To: "PNWVHFS" <PNW...@googlegroups.com>
Sent: Tuesday, May 27, 2008 8:58 AM
Subject: [PNWVHFS] Re: 6M Activity?

>

[Barry Garratt]

Bill et al,

 

The link at the bottom will take you to a site where you can download the current database files.

-----------------------------------------------------------------------------------------------------------------------------

 DTV Station Status per FCC CDBS – May 21 2008

LICENSED (LIC): 1236 (+5)
CONSTRUCTION PERMIT (CP): 649 (+22)
CP Modification (CP MOD): 279 (-0-)
STA (All variations - authorized): 1016 (–2)
STA (Modifications): 161 (-0-)
APPLICATIONS (minus rule making and channel/service elections): 367 (–9)

Rule making - Digital channel changes
PENDING APPLICATIONS: 17 (-0-)
GRANTS: 156 (-0-)

Final DTV Facilities Only (dtv_type = “posttran” or “both”)
CONSTRUCTION PERMIT (CP): 432 (+28)
CP Modification (CP MOD): 63 (+7)
APPLICATIONS: 134 (–11)

(Change from May 7, 2008, listing)

Note: These totals do not include digital class A TV, low-power TV or TV translator entries. The total will be greater than the number of DTV stations as some stations have licenses, construction permits and applications on file. Some stations also have licenses, construction permits or applications for backup facilities (auxiliary broadcast). Subtracting the STA Modification number from the number in STA (All variations) will give a more accurate indication of the number of DTV stations operating under STA, although STA records sometimes remain in the CDBS long after the licensed facility is operational. Entries with the call sign “TEST” are not included.

A spreadsheet (dtvdb.zip) showing all DTV entries (including digital LPTV and translator) in the FCC CDBS TV engineering database files as well as a spreadsheet (tvdb.zip) showing the entire TV engineering database (large file – more than 2 MB) extracted from the CDBS will be available at www.xmtr.com/fcc/. The May 21, 2008, spreadsheets are available for download now.

---

From: Bill W5WVO [mailto:w5...@cybermesa.net]
Sent: Tuesday, May 27, 2008 12:53 PM
To: bgar...@earthlink.net; kj...@innercite.com; pnw...@googlegroups.com
Subject: Re: [PNWVHFS] Re: 6M Activity?

[Edward Cole]

Hmm...find this hard to believe. Chans 2-4 are excellent long-range
frequencies for TV, this is why you find them brosdcasting to rural
areas...good in mountainous areas.

But then maybe the spectrum will be turned over for baby-minders or
picture-phones :-)

Channel-2 in Anchorage (KTUU) sits on top of a 900-foot tower and
runs big power so they can serve a really wide area. I find it hard
to think they will easily be moved up to above 175-MHz considering
the expense in changing antennas and transmitters.

I am fringe to them at 75-miles and 15 further miles south are
located VHF translators for all the VHF stations in Anchorage
(starting on chan-3). Of course there are lots of folks with ku-band
TV dishes that get network-TV via the satellite (what we have) and in
town there is cable.

73 Ed - KL7UW

[KJ6KO]

I asked the same questions. The answer I got from a CBS Broadcast Engineer
was that it is very difficult to keep the entire 6MHz bandwidth flat at the
lower frequencies like CH2 because of the % of bandwidth vs frequency. At
500 MHz it is very easy as 6MHz of bandwidth is a small percentage of the
frequency. Aparently frequency response within the 6MHz range is very
important in digital TV.
Just relaying what I was told.

73 de Greg KJ6KO

----- Original Message -----
From: "Edward Cole" <kl...@acsalaska.net>
To: <gpd...@gmail.com>; "PNWVHFS" <PNW...@googlegroups.com>
Sent: Tuesday, May 27, 2008 8:48 PM
Subject: [PNWVHFS] Re: 6M Activity?

>

[eaglep...@juno.com]

The other problem is is the pulse noise problem you
see in Band-I (54-88 MHz), which is very minimal in band-III
(174-216 MHz).
The forward error correction in the DTV receivers have some
problem correcting for this and it is estimated they (TV stations)
would have to run more power to compensate for this.

The question about gain flatness is also correct, it is estimated you need gain flatness with in 1/2 db across entire 6 MHz channel.

Seems the only interest in Band-I will be from folks with low power
and class-A TV stations who do not have to transition on Feb 2009
to Digital. Keep your ears and eyes out, there are a number of these stations staying on the air on NTSC with increased Aural to Visual
power levels and acting as a FM radio station with nebulous video!
The standard V/A level is 10:1, some of these guys will be running
1:1 .

Mike Bach
WB6FFC
Broadcast Sales Eng
Kathrein Inc, Scala Div

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