690, 710 and 730 in Mexico City....huh?

[cd637299]

Hola....

Question.....how did the 710 station in Mexico City get authorized, with a 690 and a 730 there (with lotsa power, to boot)?

How do the three get along? How does 710 sound on older radios there, with little-to-no selectivity? Wouldn't any radio be a mess with all those frequencies?

Cue Mr. Eduardo.....cue Mr. Eduardo.....

cd

 

[davideduardo]

Hola....

Question.....how did the 710 station in Mexico City get authorized, with a 690 and a 730 there (with lotsa power, to boot)?

How do the three get along? How does 710 sound on older radios there, with little-to-no selectivity? Wouldn't any radio be a mess with all those frequencies?

Cue Mr. Eduardo.....cue Mr. Eduardo.....

The three have been there peacefully coexisting since the 60's... with no problem. When I lived in Mexico City, 690 was 20 kw, 710 was 1 kw and 730 was 100 kw. No problems then, and now that 690 is 100 kw and 710 is 10 kw, there is still no issue.

Remember that the FCC rules for separation were developed well before radio circuitry evolved.

In much of Latin America stations are licensed at 20 kHz intervals in the same city. I owned AM's in Quito on 570 and 590, and am very familiar with the spacing and any issues. One of my sites, 570, was north of the city, and the other was to the far south, perhaps 35 km apart. Yet once off the site and the surrounding property, each could be picked up in the vicinity of the other on any radio I ever used.

In fact, that market had AMs on 550, 570, 590, 610, 640, 670, 700, 720, 740, 760, 780, 805, 835, 860, 880, 900, 920, 940, 960, 990, 1020, 1070, 1090, 1111, 1140, 1160, 1180, 1210, 1245, 1280, 1310, 133, 1360, 1380, 1410, 1430, 1460, 1490, 1520, 1450, 1570 and 1600.

 

[cd637299]

Okay, but I'd be thinking maybe of experimenting one day if I ever visited there...with a Juliette or Coby analog radio.....

cd

 

[davideduardo]

Okay, but I'd be thinking maybe of experimenting one day if I ever visited there...with a Juliette or Coby analog radio.....

Keep in mind that the income levels in Mexico are still much lower than in the US, and so many radios are even more cheaply made than the worst we can get here in the US. And when I was in Ecuador, the annual household income averaged less than $1000 a year, so radios tended to be of cheap manufacture, particularly since they were subject to about 100% taxation... and still no problems.

 

[radioman148]

Hola....

Question.....how did the 710 station in Mexico City get authorized, with a 690 and a 730 there (with lotsa power, to boot)?

How do the three get along? How does 710 sound on older radios there, with little-to-no selectivity? Wouldn't any radio be a mess with all those frequencies?

Cue Mr. Eduardo.....cue Mr. Eduardo.....

cd

When I was in Mexico City several times in the 60s I heard hets between those frequencies and that was using a Zenith Trans Oceanic.

 

[Ai4i]

Remember, the whole game in the US is about protectionist lobbyists.
Giving the listeners more from which to choose comes from this place.

 

[davideduardo]

When I was in Mexico City several times in the 60s I heard hets between those frequencies and that was using a Zenith Trans Oceanic.

Where I was living in 1963, the Colonia del Valle very near Xola, all three sounded good; no het, fully distinguishable and no interference.

 

[davideduardo]

Remember, the whole game in the US is about protectionist lobbyists.
Giving the listeners more from which to choose comes from this place.

I think I voted for one of those guys... the goat looks familiar, too.

 

[RadioFixerCLE]

Okay, but I'd be thinking maybe of experimenting one day if I ever visited there...with a Juliette or Coby analog radio.....

Keep in mind that the income levels in Mexico are still much lower than in the US, and so many radios are even more cheaply made than the worst we can get here in the US. And when I was in Ecuador, the annual household income averaged less than $1000 a year, so radios tended to be of cheap manufacture, particularly since they were subject to about 100% taxation... and still no problems.

Yeah. The types of radios you buy from street sellers in Latin America are things on the same scale as the Coby, Jwin, QuantumFX, GPX, Naxa, Supersonic and other such brands you get at local USA drug and discount stores. A lot of them work fine on FM....but AM nowadays, they're wide as a barn door, though.

But then again, most people who have those are listening to FM anyway, so what does it matter? And as long as the AM station carrying the ball games comes in clear on game day - that's all they probably use it for.

When I was in Cali years back I bought a couple cheap street-vendor radios. Depending on the radio, two high-powered stations 20 khz awy from each other - 1080 and 1110 - would sometimes bleed into each other (mostly 1080 would bleed over into 1110). One was significantly worse than the other.

When I visited people who had held on to older table and console radios (50s, 60s or 70s), this problem wouldn't present itself on their sets. Also, modern decent quality radios (Sony or Panasonic) are also able to deal with stations that close together with no problem.

 

[Ai4i]

...two high-powered stations 20 khz awy from each other - 1080 and 1110...

Do those street vendors also sell cheap pocket calculators ???

 

[RadioFixerCLE]

...two high-powered stations 20 khz awy from each other - 1080 and 1110...

Do those street vendors also sell cheap pocket calculators ???

I miscounted. I meant 30 khz. I was thinking 2 spots away. :

 

[Ai4i]

Three spots away...calculator is one of the standard apps in every Windows computer.

 

[Gregg]

Growing up in the NYC area, where we have 50,000 watt stations at both 1010 and 1050, I remember hearing one station under the other on a cheap radio. Not on a car radio or more modern radios. On a cheap radio, 1010 might also bleed into 970, at the time a 5000 watt station. These stations were not unlistenable but when the station you were listening to was totally quiet, you heard the other.

On the other hand, I also remember being in the Toronto area where there are 50,000 watt stations on 590 and 640 plus a 10,000 watt station on 610 in St. Katherines, about 30 miles away, across Lake Ontario. All stations could be heard clearly in both St. Katherines and Toronto, although again, I was using a car radio and a Sony Walkman. I wonder if there might have been a problem if I were listening on a cheaper radio.

Gregg
[email protected]

 

[MarioMania]

I'll bet the FCC won't never allow that ever

 

[Ai4i]

Which is it, never or ever, you said both!

 

[MarioMania]

Never......

 

[schmave]

Hola....

Question.....how did the 710 station in Mexico City get authorized, with a 690 and a 730 there (with lotsa power, to boot)?

How do the three get along? How does 710 sound on older radios there, with little-to-no selectivity? Wouldn't any radio be a mess with all those frequencies?

Cue Mr. Eduardo.....cue Mr. Eduardo.....

The three have been there peacefully coexisting since the 60's... with no problem. When I lived in Mexico City, 690 was 20 kw, 710 was 1 kw and 730 was 100 kw. No problems then, and now that 690 is 100 kw and 710 is 10 kw, there is still no issue.

Remember that the FCC rules for separation were developed well before radio circuitry evolved.

In much of Latin America stations are licensed at 20 kHz intervals in the same city. I owned AM's in Quito on 570 and 590, and am very familiar with the spacing and any issues. One of my sites, 570, was north of the city, and the other was to the far south, perhaps 35 km apart. Yet once off the site and the surrounding property, each could be picked up in the vicinity of the other on any radio I ever used.

In fact, that market had AMs on 550, 570, 590, 610, 640, 670, 700, 720, 740, 760, 780, 805, 835, 860, 880, 900, 920, 940, 960, 990, 1020, 1070, 1090, 1111, 1140, 1160, 1180, 1210, 1245, 1280, 1310, 133, 1360, 1380, 1410, 1430, 1460, 1490, 1520, 1450, 1570 and 1600.

What market needs this many stations??

 

[davideduardo]

In fact, that market had AMs on 550, 570, 590, 610, 640, 670, 700, 720, 740, 760, 780, 805, 835, 860, 880, 900, 920, 940, 960, 990, 1020, 1070, 1090, 1111, 1140, 1160, 1180, 1210, 1245, 1280, 1310, 133, 1360, 1380, 1410, 1430, 1460, 1490, 1520, 1450, 1570 and 1600.

What market needs this many stations??

No market needs that many... and thats not including the 55 FMs this market now has. The AM number has dropped by about 20, but there are still 70 stations in that market of 1.5 million, all fulltime and all with basically no maximum power limit. And before AM started to decline, there were station on 1225 and 1070 and 530 and 660 (670 moved to 680.

The market is Quito, where I owned 570, 590, 805, 660, 91.9, 92.3, 95.1, 95.7 and 93,7.

 

[cd637299]

In fact, that market had AMs on 550, 570, 590, 610, 640, 670, 700, 720, 740, 760, 780, 805, 835, 860, 880, 900, 920, 940, 960, 990, 1020, 1070, 1090, 1111, 1140, 1160, 1180, 1210, 1245, 1280, 1310, 133, 1360, 1380, 1410, 1430, 1460, 1490, 1520, 1450, 1570 and 1600.

What market needs this many stations??

No market needs that many... and thats not including the 55 FMs this market now has. The AM number has dropped by about 20, but there are still 70 stations in that market of 1.5 million, all fulltime and all with basically no maximum power limit. And before AM started to decline, there were station on 1225 and 1070 and 530 and 660 (670 moved to 680.

The market is Quito, where I owned 570, 590, 805, 660, 91.9, 92.3, 95.1, 95.7 and 93,7.

I was in Quito in August 1992 for an HCJB (missionary shortwave radio)-sponsored tour. I brought a small radio, but never bothered to check out all the AM stations and their differences. I did, however, borrow a colleague's boombox to record some FM stations there. Always nice to make your own souvenirs!

BTW Quito has what I call "perfect weather" (or near perfect) - high about 70 F & low about 50 F - all year long! No need for air conditioner or heater. When I was there, it was illegal to run an air conditioner....I would not be surprised if it was still enforced. That said, I still was concerned about possible earthquakes that do occur there.

cd

 

[Ai4i]

Wonder why HCJB was unable to sell the SW facility instead of dismantling it, same with PJB, Bonaire.
SOMEONE could have used it/them!