Quote From Radio World Sept. 13 about HD Radio

[SUPERCASTER]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

 

[IBOCRocks]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

 

[SUPERCASTER]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

 

[zumahans]

---->They're measuring in the crowded non-comm band. That is not the case in the commercial band.

The commercial band is not crowded? Get serious. 92-108 is jam packed in almost every metro area.

 

[IBOCRocks]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

Hmmm. CPB? 99% of their studies (see: FM Modulators) focus on 88-92MHz, where there is little in the way of separation rules.

 

[IBOCRocks]

---->They're measuring in the crowded non-comm band. That is not the case in the commercial band.

The commercial band is not crowded? Get serious. 92-108 is jam packed in almost every metro area.

The non-comm band is much more crowded. The minimum seperation rules are MUCH less stringent below 92MHz. It's not uncommon to see several co- and adjacent-channels in the same metro.

So yes, I stand by my statement.

 

[vsa]

IBOCROCKS WROTE: "The non-comm band is much more crowded. The minimum seperation rules are MUCH less stringent below 92MHz. It's not uncommon to see several co- and adjacent-channels in the same metro."

Here in the Los Angeles Metro, we have grandfathered FMs above 92mHz within the same same metro too.

KDLD Santa Monica at 103.1 and KDLE Newport Beach at 103.1.
KBUA San Fernando at 94.3 and KEBM Garden Grove at 94.3.

When you include stations immediately bordering the metro, we have 2 or even 3 stations sharing 92.7, 93.5, 95.9, 96.7, 98.3, 105.5, and 107.1.

 

[IBOCRocks]

IBOCROCKS WROTE: "The non-comm band is much more crowded. The minimum seperation rules are MUCH less stringent below 92MHz. It's not uncommon to see several co- and adjacent-channels in the same metro."

Here in the Los Angeles Metro, we have grandfathered FMs above 92mHz within the same same metro too.

KDLD Santa Monica at 103.1 and KDLE Newport Beach at 103.1.
KBUA San Fernando at 94.3 and KEBM Garden Grove at 94.3.

When you include stations immediately bordering the metro, we have 2 or even 3 stations sharing 92.7, 93.5, 95.9, 96.7, 98.3, 105.5, and 107.1.

The stations you mention, IIRC, meet minimum separation rules (the LA metro is HUGE). In non-comm, there are no rules, so the co-channels can be very closely spaced, even in small markets.

 

[vsa]

The grandfathered FMs do not meet current separation rules. Although non-coms do not need to strictly adhere to distance/separation requirements, they still must adhere to non-inteference requirements. A mountain in between both non-com stations is an example where spacing can be greatly reduced.

 

[IBOCRocks]

The grandfathered FMs do not meet current separation rules. Although non-coms do not need to strictly adhere to distance/separation requirements, they still must adhere to non-inteference requirements. A mountain in between both non-com stations is an example where spacing can be greatly reduced.

Or three Class A's within 20 miles of each other using directional antennas. So yeah, HD-2 won't perform well there.

 

[zumahans]

And does NY not have identical issues?

San Diego?

Schenectady?

 

[IBOCRocks]

And does NY not have identical issues?

San Diego?

Schenectady?

We're talking abou the non-comm band, so yes, they do. OTOH, I was listening to an HD-2 35 miles away from the transmitter this afternoon, which is well past the 95 dbu contour. So, mileage may vary.

 

[zumahans]

I would guess that less than 20 percent of the Los Angeles market population lives within 35 miles of Mount Wilson's transmitter ghetto.

 

[IBOCRocks]

I would guess that less than 20 percent of the Los Angeles market population lives within 35 miles of Mount Wilson's transmitter ghetto.

Yes, but substantially more than that have direct line of sight. It doesn't take much HD signal to do the trick.

 

[SUPERCASTER]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

Hmmm. CPB? 99% of their studies (see: FM Modulators) focus on 88-92MHz, where there is little in the way of separation rules.

You are confusing two completly different statements.
The first sentence is about CPB, the second is about Doug Vernier of V-Soft, and has nothing to do with non-com stations or frequencies.
http://www.v-soft.com/

 

[SaynotoIB0C]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

Hmmm. CPB? 99% of their studies (see: FM Modulators) focus on 88-92MHz, where there is little in the way of separation rules.

You are confusing two completly different statements.
The first sentance is about CPB, the second is about Doug Vernier of V-Soft, and has nothing to do with non-com stations or frequencies.
http://www.v-soft.com/

I like the neat little paralleagram being created by all the quotes!

 

[IBOCRocks]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

Hmmm. CPB? 99% of their studies (see: FM Modulators) focus on 88-92MHz, where there is little in the way of separation rules.

You are confusing two completly different statements.
The first sentance is about CPB, the second is about Doug Vernier of V-Soft, and has nothing to do with non-com stations or frequencies.
http://www.v-soft.com/

The key word is "may". In my experience, I have never lost an HD-2 within the 60 dbu contour. Doesn't mean it will, or doesn't happen, just means that like anything else RF, it's impossible to accurately model what will happen. The proof is in the final product.

 

[IBOCRocks]

Radio World Sept. 13, 2006 "Tech Topics" Pg. 57

Recent studies for the Corporation for Public Broadcasting are also changing some earlier ideas about the coverage range of FM digital signals. Vernier says operators of HD2 and HD3 subchannels are learning that they may enjoy solid, useable coverage only to their 93 or 94 dBu contours"

50 mV?
That's not far!

They're measuring in the crowded non-comm band. That is not the case in the commercial band.

Vernier does not specify non-com or commercial band, just HD2 and HD3 operators.

Hmmm. CPB? 99% of their studies (see: FM Modulators) focus on 88-92MHz, where there is little in the way of separation rules.

You are confusing two completly different statements.
The first sentance is about CPB, the second is about Doug Vernier of V-Soft, and has nothing to do with non-com stations or frequencies.
http://www.v-soft.com/

I like the neat little paralleagram being created by all the quotes!

You're old hat now.

SayNoToIBOC is now PLL.

 

[SaynotoIB0C]

How can I masquarade as PLL?

hmmmmm

 

[zumahans]

I think you have to apply to join the cartel.