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WJR hits the fan with iBiquity??

Well, sure I'd want to keep any radio that had diversity FM, a very useful feature that should have been standard a long time ago.

I can't argue at all that most of the FM sections sound just fine, and I have no issues with step tuning on FM.
I could probably even be happy with the AM being down 10 db at almost 3 khz, because that implies that the IF bandwidth
is roughly 6khz, the center tuning giving roughly 3khz audio. If I could side tune that to the clearer of the two side bands, I could choose then to listen such a station with audio ?-3000 hz or side tuned with audio from ?-6000 hz. It would be the users choice.
It would not require any extrra circuitry, just the ability to output finer resolution steps of voltage to the varactor tuning diodes and
oscillator circuits.

It would look odd to see a old tank car radio hanging under the dash of a Lexus.
One of the many reasons I drive a 1965 car is for the radio. Well, the radio's a '72.
The AM in it had one cap rolling off frequency response, which I lifted one leg of.
The IF is about 15 kc wide, but center tuning on medium strength signal is not a problem with adjacents.
It's not so good on strong adjacents, but the audio is something I wish I could share with others, who listen on muffleboxes.
I put in earplugs when I want my radio to sound like that.
Or I have the Collins 390 cranked in narrow bandwidths to hear something weak and distant.

Ford and Chrysler were some of the last good sounding AMs, and even last spring when I went to Jersey City, the 2006 Ford had
acceptably crisp AM for strong signals. It seemed narrower on weak signals, and may have had variable IF, or it could just be an AVC effect.
 
Kelly said:
This, (along with the old AM Stereo bbs), has dealt with the AM receiver audio response issue numerous times. But, because it's been a few years since I ran my own updated test, albeit somewhat quick, I thought it would be time to revisit the subject with my stable of vehicles. Now rather than taking a feed directly off the AC output to the speakers, assuming impedance matching issues, speaker audio reponse, etc., I decided to measure response using a White Instruments audio spectrum analyzer, and a microphone with a known response curve, (Electrovoice RE-20 set to flat EQ), right out of the various vehicle speakers. Below is the result. The two vehicles sampled were my 1998 Jeep Cherokee with a Chrysler factory AM-FM-CD-Cassette unit, equalizer set at flat. Measurements were taken at the door speakers, microphone on a stand one foot away. Audio was sampled from four different FM, four different AM stations, and one AM station currently running AM-HD. BTW, the Jeep radio has a AM Stereo tuner, but there are no stations currently running AM stereo in the market. The same test was run on my 2006 Lexus GS with a Mark Levinson sound system. Of particular note was the high frequency response. Because there was no AM music stations, where possible samples were made from similar, or the same commercials running on both AM and FM stations which contained music and voice in combination. The analyzer was set for a 3 minute peak and hold sample for each station, stored and reviewed when the testing was completed.

Lexus 3 minute unweighted Station 1, (News Talk) Low Frequency cut-off -10db at 250hz. High Frequency cut off was -10db at 2.8kHz, (voice and commercial music).

Exact same response for similar stations 2, 3, 4, and the AM HD station, (Radio Disney format). Based on the results, one could assume that response limitations were related to the AM tuner.

Lexus 3 minute unweighted FM station 1, (Classic Hits), Low Frequency cut off -10db at 65hz. High Frequency cut-off was -10 at 12.3kHz, (voice and commercial music).

Lexus FM Station 2 was CHR, LF -10db 52Hz, HF -10 at 12.3KHz.

Lexus FM Station 3 was Classical, LF -10db 64hz, HF -10 at 12.3kHz.

Lexus FM Station 4 was AAA, LF -10db 58hz, HF -10 at 12.3kHz.

Jeep 3 minute unweighted Station 1, (News Talk) Low Frequency cut-off -10db at 140hz. High Frequency cut off was -10db at 3.5kHz, (voice and commercial music).

Jeep AM Station 2, and 3 were the same response.

Jeep AM Station 4 was less frequency response both LF and HF, LF cut off -10 at 200hz, HF cut off was -10db at 2.8kHz.

Jeep AM-HD Station, (Radio Disney), LF -10 at 250hz, HF cut off -10 at 2.8kHz. I heard no data noise in the analog audio.

Jeep 3 minute unweighted FM station 1, (Classic Hits), Low Frequency cut off -10db at 80hz. High Frequency cut-off was -10 at 11.8kHz, (voice and commercial music).

Jeep FM Station 2 was CHR, LF -10db 52Hz, HF -10 at 10.5KHz.

Jeep FM Station 3 was Classical, LF -10db 65hz, HF -10 at 12.3kHz.

Jeep FM Station 4 was AAA, LF -10db 60hz, HF -10 at 12.5kHz.


Jeep AM radio... :D I'm still laughing.... The first thing I did on my wife's Jeep Cherokee Country I bought her in 1995 was to replace the radio as the AM section was almost riduculus, non existant and the worst radio I've ever heard from any auto manufacturer... it was so wide that all it picked up was noise unless you were right under the freakin' antenna!

Radiopilot
 
radiopilot said:
Jeep AM radio... :D I'm still laughing.... The first thing I did on my wife's Jeep Cherokee Country I bought her in 1995 was to replace the radio as the AM section was almost riduculus, non existant and the worst radio I've ever heard from any auto manufacturer... it was so wide that all it picked up was noise unless you were right under the freakin' antenna!

The problem is that most people do not do that... they just listen to FM as they always have and don't care what AM sounds like, buecause, unless they are in upper demos or a rabid sports fan, they never use AM anyway.
 
DavidEduardo said:
radiopilot said:
Jeep AM radio... :D I'm still laughing.... The first thing I did on my wife's Jeep Cherokee Country I bought her in 1995 was to replace the radio as the AM section was almost riduculus, non existant and the worst radio I've ever heard from any auto manufacturer... it was so wide that all it picked up was noise unless you were right under the freakin' antenna!

The problem is that most people do not do that... they just listen to FM as they always have and don't care what AM sounds like, buecause, unless they are in upper demos or a rabid sports fan, they never use AM anyway.

Lots of people care about AM... a hell of alot do David.

When I lived in Seattle from 1988-1996 most if not all my listening was to AM and FM, unfortunately in Seattle there is no 'latin' based radio stations other than the occasional use of the 'PBR-NPR' broadcasts of 1-2 hours of 'Spanish' broadcasting.

Now that I live in Savannah, I get to hear WVVM 1670 AM - Macon, GA. and
WONQ 1030 AM - Orlando, FL. and it's great to get these stations and let me tell you the music sounds just as good on my Grundig as any FM broadcast station mind you the highs are not there but the mellowness of this music far exceeds the programming on FM as Savannah has no Spanish broadcasting station, other than the public use of Savannah State Univ. radio station for which they only play 'Mexican/Salsa' and that's all they play... I don't even listen to it!

My point David is demos don't mean anything if it's not registering 'those' that listen and they're not just rabid sports fans or Rushbots, O'reillybots, or other right wing bellows on the air!

Radiopilot
 
radiopilot said:
Lots of people care about AM... a hell of alot do David.

But this year it is less than last year. And last year was less than the year before. AM is declining, to the extent that in on major market, Houston, AM has less than a 12% share. And in smaller markets, single digit shares are now common. In 18-34, the shares are even smaller, typically a third of the 12+ share, because the listening is mostly over 55.

When I lived in Seattle from 1988-1996 most if not all my listening was to AM and FM, unfortunately in Seattle there is no 'latin' based radio stations other than the occasional use of the 'PBR-NPR' broadcasts of 1-2 hours of 'Spanish' broadcasting.

There are three Spanish language stations there now. One is Bustos Media, two are Salem.

Now that I live in Savannah, I get to hear WVVM 1670 AM - Macon, GA. and
WONQ 1030 AM - Orlando, FL. and it's great to get these stations and let me tell you the music sounds just as good on my Grundig as any FM broadcast station mind you the highs are not there but the mellowness of this music far exceeds the programming on FM as Savannah has no Spanish broadcasting station, other than the public use of Savannah State Univ. radio station for which they only play 'Mexican/Salsa' and that's all they play... I don't even listen to it!

The Orlando stations has trouble breaking a 0.8 share, while the two FMs have 9 shares between them. Hispanics have a much lower tolerance for AM, in fact... because the average age of Hispanics is lower by a considerable amount of years.

My point David is demos don't mean anything if it's not registering 'those' that listen and they're not just rabid sports fans or Rushbots, O'reillybots, or other right wing bellows on the air!

I'm not sure I understand "what" is not registering. The Rush / O'rielly content is what still works on AM, although in many markets it is getting moved to FM.
 
DavidEduardo said:
The Orlando stations has trouble breaking a 0.8 share, while the two FMs have 9 shares between them. Hispanics have a much lower tolerance for AM, in fact... because the average age of Hispanics is lower by a considerable amount of years.

I guess most us old-school Hispanics moved back to our home countries. ;D
 
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