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Author Topic: Dont buy a flex radio...  (Read 45694 times)
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Pete, WA2CWA
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« Reply #75 on: October 28, 2009, 02:42:44 PM »

What is the problem with the AMFONE web site? If I try to quote a long response, the window to type my reply along with the Quote jumps and I cannot get to the bottom of the quote to start typing...................Happens on every computer I use to access AMFONE. Three home computers and a work computer 33 mi. from home.

I was going to quote Rob about the display from SDR being a distraction. I find it pretty useful using my simple SoftRock Lite board that I can enable the proper filter or move the I.F. around to get away from an offending signal or broad signal or splatter from an A.M. QSO 4 kc away. And the listening pleasure resumes, instead of cursing and swearing.

Fred

The problem happens with IE.
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
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« Reply #76 on: October 28, 2009, 02:56:35 PM »

Yep IE 7 or 8 or whatever I'm using now....

Not just AMfone, but every BB I frequent......

Wish I could find a setting somewhere, because it's VERY annoying!!   Huh
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W2PHL
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« Reply #77 on: October 28, 2009, 03:51:36 PM »

Need to read the specs:

Flex 3000 - For AM operation, the transmit audio response is from 10 Hz to 7.3 kHz, since it's controlled only by the firmware. http://kc.flex-radio.com/KnowledgebaseArticle50352.aspx


10 Hz to 7.3 KHz audio response would be nice, or is it 10Hz to 3.65 KHz audio response for a total AM TX bandwidth of 7.3 KHz? There seems to be some confusion out there.
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WA1GFZ
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« Reply #78 on: October 28, 2009, 04:02:48 PM »

Gee, I'm using Flex software with my HPSDR and the 10 band TX EQ goes out to about 8 KHz if I remember. My only issue is you can't modulate over 100% limited by software.
Flex IF is 10 or 11 kHz so that would limit the bandwidth
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Pete, WA2CWA
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« Reply #79 on: October 28, 2009, 04:53:01 PM »

Need to read the specs:

Flex 3000 - For AM operation, the transmit audio response is from 10 Hz to 7.3 kHz, since it's controlled only by the firmware. http://kc.flex-radio.com/KnowledgebaseArticle50352.aspx


10 Hz to 7.3 KHz audio response would be nice, or is it 10Hz to 3.65 KHz audio response for a total AM TX bandwidth of 7.3 KHz? There seems to be some confusion out there.

The specs in the links I provided should answer your question, but each sideband mode maximum is 3.65 kHz, so, since AM has two sidebands, 3.65 + 3.65 = 7.3 kHz.
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
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« Reply #80 on: October 28, 2009, 05:56:37 PM »


The specs in the links I provided should answer your question, but each sideband mode maximum is 3.65 kHz, so, since AM has two sidebands, 3.65 + 3.65 = 7.3 kHz.

yes Pete but previously you posted:

Need to read the specs:
Flex 5000A or 5000C - For AM operation, the transmit audio response is from 10 Hz to 20 kHz, since it's controlled by the software. http://kc.flex-radio.com/KnowledgebaseArticle50044.aspx

Flex 3000 - For AM operation, the transmit audio response is from 10 Hz to 7.3 kHz, since it's controlled only by the firmware. http://kc.flex-radio.com/KnowledgebaseArticle50352.aspx

Audo response and transmit bandwidth are two different things.

Rob
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« Reply #81 on: October 28, 2009, 06:21:58 PM »


The specs in the links I provided should answer your question, but each sideband mode maximum is 3.65 kHz, so, since AM has two sidebands, 3.65 + 3.65 = 7.3 kHz.

yes Pete but previously you posted:

Need to read the specs:
Flex 5000A or 5000C - For AM operation, the transmit audio response is from 10 Hz to 20 kHz, since it's controlled by the software. http://kc.flex-radio.com/KnowledgebaseArticle50044.aspx

Flex 3000 - For AM operation, the transmit audio response is from 10 Hz to 7.3 kHz, since it's controlled only by the firmware. http://kc.flex-radio.com/KnowledgebaseArticle50352.aspx

Audio response and transmit bandwidth are two different things.

Rob

If the bandwidth is limited to 3.6K either side of carrier, no audio above that gets through, depending, of course on what we mean by limited.  In a dull (as opposed to sharp filter) that might mean some frequency like say 3.6K is the -6 dB point with a gradual roll off after that, so audio above 3.6K does get through, it's just progressively attenuated.  I suspect, however,  in the Flex it's a brick wall filter so zip above 3.6K gets through period.  The Tx equalization above that is irrelevant.  That audio is not getting out of the radio.

I have listened to a Flex 3000 and watched it on the panadpater of my Flex 1000 so I should know the answer but dang I forgot.

I am right about this, aren't I?
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W2PHL
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« Reply #82 on: October 28, 2009, 06:36:33 PM »

Yes that's correct. If the Flex 3000 transmits 10 Hz to 7.65 KHz worth of audio response, then it's AM signal would be 15.3 Khz wide.
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