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Author Topic: HF Radios on AM  (Read 3148 times)
G3RZP
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« Reply #30 on: September 01, 2018, 01:06:01 AM »

Do these rigs do 'real' AM i.e. two sidebands and carrier, or do they do 'compatible' AM, i.e. one sideband plus carrier?
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N8YX
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« Reply #31 on: September 01, 2018, 11:24:29 PM »

Do these rigs do 'real' AM i.e. two sidebands and carrier, or do they do 'compatible' AM, i.e. one sideband plus carrier?
As I mentioned earlier...many are AME. It wouldn't matter if it was just one sideband plus carrier if the carrier power varied as a function of applied modulation - but it doesn't. It's fixed. As such, there's only one narrow range of audio power where the setup sounds good.

A number of the vaunted rigs of yesteryear did it this way.
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K5TED
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« Reply #32 on: September 02, 2018, 02:12:42 PM »

I got good reports on 15m AM with a FT-857D. Kenwood TS-140S also got good reports on 15m and 10m.
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K9MHZ
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« Reply #33 on: September 02, 2018, 03:11:23 PM »

As I mentioned earlier...many are AME. It wouldn't matter if it was just one sideband plus carrier if the carrier power varied as a function of applied modulation - but it doesn't. It's fixed. As such, there's only one narrow range of audio power where the setup sounds good.

A number of the vaunted rigs of yesteryear did it this way.

Heath did the controlled carrier deal with the DX-60, presumably to use lighter components as well as not having to plate modulate.  Seemed like an AM signal on top of the background noise rather than killing it all with a continuous carrier with modulation on top, like the DX-100.

They sounded OK, but the heavy iron always sounded more pleasant, IMO.

  
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KM1H
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« Reply #34 on: September 03, 2018, 11:46:40 AM »

All Drakes use controlled carrier and sound good and can be made to sound better. Same with the several Heath and other brands as there is lots of info on line.

I use a TS-940 and TS-950SD on AM at times and once adjusted using the spectrum analyzer they sound fine. Using a D-104 and impedance converter certainly helps plus the 950SD has selectable audio out to 3 KHz and can be modified to TX thru the 12 KHz LC filter for a lot more.

Carl
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KE0ZU
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« Reply #35 on: September 03, 2018, 03:51:31 PM »

A lot of rice boxes sound fine on AM.    I have an FT-101, a set of 101 twins, and a FT-990 and a few other rice burners that do a respectable job and have received good AM reports.   As mentioned, Flex computers sound good also.   

Someone in an earlier post was inferring AM is wasting bandwidth, but its well known that with some people, even CW is a waste of bandwidth.
« Last Edit: September 03, 2018, 03:58:59 PM by KE0ZU » Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
WZ7U
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Posts: 1073




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« Reply #36 on: September 03, 2018, 04:44:07 PM »

A lot of rice boxes sound fine on AM.    I have an FT-101, a set of 101 twins, and a FT-990 and a few other rice burners that do a respectable job and have received good AM reports.   As mentioned, Flex computers sound good also.   

Someone in an earlier post was inferring AM is wasting bandwidth, but its well known that with some people, even CW is a waste of bandwidth.
No, I was referring to Chuckies post as a waste of bandwidth. AM is worth the bandwidth.
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W0BKR
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« Reply #37 on: September 05, 2018, 03:58:08 PM »

So, about how much power can one run with the solid state radios on AM?

10-20 watts unmodulated (no talking just PTT)?
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K9MHZ
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Posts: 1725




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« Reply #38 on: September 05, 2018, 06:55:08 PM »

A lot of rice boxes sound fine on AM.    I have an FT-101, a set of 101 twins, and a FT-990 and a few other rice burners that do a respectable job and have received good AM reports.   As mentioned, Flex computers sound good also.   

Someone in an earlier post was inferring AM is wasting bandwidth, but its well known that with some people, even CW is a waste of bandwidth.
No, I was referring to Chuckies post as a waste of bandwidth. AM is worth the bandwidth.

It was pretty funny, I thought.
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WZ7U
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« Reply #39 on: September 05, 2018, 11:30:22 PM »

Well, yeah, it was a little bit.  Wink
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KC8KTN
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Posts: 1867


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« Reply #40 on: September 06, 2018, 12:00:23 AM »

Wow The President and Vice President of the W.T.T.C. back to back. So Rare.  Keeping it real .. Nuff Said 
Everyone Have a Joyous Day and Be SAFE. 73s.. and 10-4...
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WZ7U
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« Reply #41 on: September 06, 2018, 01:27:25 AM »

Wow The President and Vice President of the W.T.T.C. back to back. So Rare.  Keeping it real .. Nuff Said 
Everyone Have a Joyous Day and Be SAFE. 73s.. and 10-4...
It's never enough said, and as fake as the nooze you listen to on the nutworks. Roger Dee Captain CB?
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W0BKR
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« Reply #42 on: September 06, 2018, 07:51:20 AM »

Must have missed something in the translation....
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K9MHZ
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« Reply #43 on: September 09, 2018, 07:06:50 PM »

All Drakes use controlled carrier
Carl

Interesting, never knew that.
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KM1H
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Posts: 4722




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« Reply #44 on: September 12, 2018, 05:42:34 PM »

So, about how much power can one run with the solid state radios on AM?

10-20 watts unmodulated (no talking just PTT)?

One quarter or less of their SSB rating. Most of my amps are fine at 20W which equals ~ 80W PEP for 1200W out.

Carl
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