<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_1_1526901551161_20545"><span>Guys,</span></div><div id="yui_3_16_0_1_1526901551161_20546"><span id="yui_3_16_0_1_1526901551161_20673">This AM discussion is a little confusing due to the terms being used.</span></div><div id="yui_3_16_0_1_1526901551161_20537"><span id="yui_3_16_0_1_1526901551161_20536">Carrier controlled AM is a method to reduce power consumption by lowering the output of the carrier when little or no audio is present. In broadcast AM transmission (especially when stations were producing up to 250kW) reducing the carrier resulted in considerable input power savings. Broadcast stations use some further black magic to increase power on audio positive going peaks while reducing modulation on negative going peaks. This prevents modulation from reducing the carrier to zero which produces significant interference out of band. High level modulation was one method of further reducing input power by using more efficient carrier amplifiers and adding modulation power in the output stage. This was also a little easier to maintain as RF stages did not need to adjusted to keep them linear.</span></div><div id="yui_3_16_0_1_1526901551161_25155" dir="ltr"><span id="yui_3_16_0_1_1526901551161_20536">Additionally, audio is bandwidth limited to further reduce power consumption and protect adjacent channels. Europe and other countries mandated 9kHz bandpass to provide more channels in the AM broadcast band. The NAB lobbied to keep 10kHz spacing in this country but many stations now filter audio to 9kHz with a filter that has a more gentle band edge slope.<br></span></div><div id="yui_3_16_0_1_1526901551161_20737"><span id="yui_3_16_0_1_1526901551161_20536">DSB is standard AM modulation with carrier. <br></span></div><div id="yui_3_16_0_1_1526901551161_20866" dir="ltr"><span id="yui_3_16_0_1_1526901551161_28073">DSBSC is AM modulation with the carrier suppressed. In this discussion, DSB has been used for this mode. </span><span id="yui_3_16_0_1_1526901551161_20536"><span id="yui_3_16_0_1_1526901551161_28074">A carrier needs to be introduced in the receiver for demodulation to occur.</span></span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_21549"><span id="yui_3_16_0_1_1526901551161_20536">SSB is one sideband with carrier. Only one sideband is needed for audio demodulation. This mode also reduces input power.</span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_21548"><span id="yui_3_16_0_1_1526901551161_20536">SSBSC suppresses the carrier resulting in additional power reduction. A carrier needs to be introduced in the receiver for demodulation to occur. <br></span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_22291"><span id="yui_3_16_0_1_1526901551161_20536">The term 'suppressed carrier' is further misused as it can mean a reduced carrier level or no carrier. "Reduced carrier" has fallen out of favor.<br></span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_33279"><span id="yui_3_16_0_1_1526901551161_20536">Eliminating the carrier in AM reduces the output power by 50%.<br></span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_23232"><span id="yui_3_16_0_1_1526901551161_20536">A simple method of modulating AM suppressed carrier signals is to use a balanced modulator. When carefully adjusted, the carrier will be completely eliminated. If the modulator is left slightly out of balance, a small amount of carrier can be present. To make this signal SSB, one only needs to pass the signal through a filter that is just wide enough to pass one sideband. This method is used in radios like the HW101. The resulting sideband energy is then passed through a series of linear stages to boost power. The output in HW101 is an AB1 linear amplifier.<br></span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_33285"><span id="yui_3_16_0_1_1526901551161_20536">Al</span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_33358"><span id="yui_3_16_0_1_1526901551161_20536">WB9UVJ</span></div><div dir="ltr" id="yui_3_16_0_1_1526901551161_33359"><span id="yui_3_16_0_1_1526901551161_20536">Broadcast Engineer, WTTW/WFMT</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Sunday, May 20, 2018 9:54 AM, "heath-request@puck.nether.net" <heath-request@puck.nether.net> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div dir="ltr">Send Heath mailing list submissions to<br></div><div dir="ltr"> <a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a><br></div><div dir="ltr"><br></div><div dir="ltr">To subscribe or unsubscribe via the World Wide Web, visit<br></div><div dir="ltr"> <a href="https://puck.nether.net/mailman/listinfo/heath" target="_blank">https://puck.nether.net/mailman/listinfo/heath</a><br></div><div dir="ltr">or, via email, send a message with subject or body 'help' to<br></div><div dir="ltr"> <a ymailto="mailto:heath-request@puck.nether.net" href="mailto:heath-request@puck.nether.net">heath-request@puck.nether.net</a><br></div><div dir="ltr"><br></div><div dir="ltr">You can reach the person managing the list at<br></div><div dir="ltr"> <a ymailto="mailto:heath-owner@puck.nether.net" href="mailto:heath-owner@puck.nether.net">heath-owner@puck.nether.net</a><br></div><div dir="ltr"><br></div><div dir="ltr">When replying, please edit your Subject line so it is more specific<br></div><div dir="ltr">than "Re: Contents of Heath digest..."<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Today's Topics:<br></div><div dir="ltr"><br></div><div dir="ltr"> 1. Re: SB-200 and AM (Kenneth G. Gordon)<br></div><div dir="ltr"> 2. DSB... (Kenneth G. Gordon)<br></div><div dir="ltr"> 3. Sales... (Mike)<br></div><div dir="ltr"> 4. Re: Sales... (<a ymailto="mailto:heathmod@centurylink.net" href="mailto:heathmod@centurylink.net">heathmod@centurylink.net</a>)<br></div><div dir="ltr"> 5. Re: DSB... (ChrisIwata)<br></div><div dir="ltr"> 6. Re: SB-200 and AM (Kenneth G. Gordon)<br></div><div dir="ltr"> 7. Re: SB-200 and AM (Glen Zook)<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">----------------------------------------------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 1<br></div><div dir="ltr">Date: Sat, 19 May 2018 15:48:55 -0700<br></div><div dir="ltr">From: "Kenneth G. Gordon" <<a ymailto="mailto:kgordon2006@frontier.com" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a>><br></div><div dir="ltr">To: ChrisIwata via Heath <<a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a>><br></div><div dir="ltr">Subject: Re: [Heath] SB-200 and AM<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:5B00A9D7.24344.ADF369F@kgordon2006.frontier.com" href="mailto:5B00A9D7.24344.ADF369F@kgordon2006.frontier.com">5B00A9D7.24344.ADF369F@kgordon2006.frontier.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=US-ASCII<br></div><div dir="ltr"><br></div><div dir="ltr">On 19 May 2018 at 14:48, ChrisIwata via Heath wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">> Is there any difference between carrier controlled AM and suppressed carrier DSB?<br></div><div dir="ltr"><br></div><div dir="ltr">Yes. A HUGE difference. Controlled-carrier AM is, after all, true AM. It has a carrier whose <br></div><div dir="ltr">power level follows the average level of the audio. Essentially, the audio controls the <br></div><div dir="ltr">amount of power out of the amplifier.<br></div><div dir="ltr"><br></div><div dir="ltr">DSB is not AM. I supposed one could call DSB, "AM-without-the-carrier".<br></div><div dir="ltr"><br></div><div dir="ltr">But DSB is far more difficult to implement than CC-AM.<br></div><div dir="ltr"><br></div><div dir="ltr">For one thing, the "simple" methods of generating DSB require two tubes in the final amp <br></div><div dir="ltr">stage, as I remember it. <br></div><div dir="ltr"><br></div><div dir="ltr">I'll go look it up again just to make sure.<br></div><div dir="ltr"><br></div><div dir="ltr">Ken W7EKB<br></div><div dir="ltr"><br></div><div dir="ltr">---<br></div><div dir="ltr">This email has been checked for viruses by Avast antivirus software.<br></div><div dir="ltr"><a href="https://www.avast.com/antivirus" target="_blank">https://www.avast.com/antivirus</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 2<br></div><div dir="ltr">Date: Sat, 19 May 2018 16:34:07 -0700<br></div><div dir="ltr">From: "Kenneth G. Gordon" <<a ymailto="mailto:kgordon2006@frontier.com" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a>><br></div><div dir="ltr">To: <a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a><br></div><div dir="ltr">Subject: [Heath] DSB...<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:5B00B46F.16934.B08989E@kgordon2006.frontier.com" href="mailto:5B00B46F.16934.B08989E@kgordon2006.frontier.com">5B00B46F.16934.B08989E@kgordon2006.frontier.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=US-ASCII<br></div><div dir="ltr"><br></div><div dir="ltr">OK. I did some research: generating a DSB signal requires a balanced modulator <br></div><div dir="ltr">somewhere in the system.<br></div><div dir="ltr"><br></div><div dir="ltr">In one case I remember, the two 1625s in an "ARC-5" transmitter were used as a <br></div><div dir="ltr">direct-to-antenna DSB transmitter.<br></div><div dir="ltr"><br></div><div dir="ltr">The screens were fed push-pull audio, while the plates were parallel-connected. As I <br></div><div dir="ltr">remember it, an oscilloscope was required to get it adjusted properly.<br></div><div dir="ltr"><br></div><div dir="ltr">DSB is far more complex than the simple controlled-carrier systems in our simple <br></div><div dir="ltr">transmitters.<br></div><div dir="ltr"><br></div><div dir="ltr">If anyone here is interested, here is a link to the "Double-Sideband Junior" from GE Ham <br></div><div dir="ltr">News of March-April 1958.<br></div><div dir="ltr"><br></div><div dir="ltr"><a href="http://n4trb.com/AmateurRadio/GE_HamNews/issues/GE%20Ham%20News%20Vol%2013" target="_blank">http://n4trb.com/AmateurRadio/GE_HamNews/issues/GE%20Ham%20News%20Vol%2013</a><br></div><div dir="ltr">%20No%202.pdf<br></div><div dir="ltr"><br></div><div dir="ltr">Ken W7EKB<br></div><div dir="ltr"><br></div><div dir="ltr">---<br></div><div dir="ltr">This email has been checked for viruses by Avast antivirus software.<br></div><div dir="ltr"><a href="https://www.avast.com/antivirus" target="_blank">https://www.avast.com/antivirus</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 3<br></div><div dir="ltr">Date: Sun, 20 May 2018 01:59:21 +0000<br></div><div dir="ltr">From: Mike <<a ymailto="mailto:MLF42@Q.com" href="mailto:MLF42@Q.com">MLF42@Q.com</a>><br></div><div dir="ltr">To: Heath <<a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a>><br></div><div dir="ltr">Subject: [Heath] Sales...<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:em89bb9b98-554f-4bb9-8810-7b66daff0467@mike-pc" href="mailto:em89bb9b98-554f-4bb9-8810-7b66daff0467@mike-pc">em89bb9b98-554f-4bb9-8810-7b66daff0467@mike-pc</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"; Format="flowed"<br></div><div dir="ltr"><br></div><div dir="ltr">Not sure about the "rules" so gotta ask...I have some items that might <br></div><div dir="ltr">of interest to guys who own HW & SB transceivers. Am I allowed to offer <br></div><div dir="ltr">them for sale?<br></div><div dir="ltr"><br></div><div dir="ltr">---<br></div><div dir="ltr">This email has been checked for viruses by AVG.<br></div><div dir="ltr"><a href="https://www.avg.com/" target="_blank">https://www.avg.com</a><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="https://puck.nether.net/pipermail/heath/attachments/20180520/282546d3/attachment-0001.html" target="_blank">https://puck.nether.net/pipermail/heath/attachments/20180520/282546d3/attachment-0001.html</a>><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 4<br></div><div dir="ltr">Date: Sun, 20 May 2018 02:12:12 +0000 (UTC)<br></div><div dir="ltr">From: <<a ymailto="mailto:heathmod@centurylink.net" href="mailto:heathmod@centurylink.net">heathmod@centurylink.net</a>><br></div><div dir="ltr">To: Heath <<a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a>><br></div><div dir="ltr">Subject: Re: [Heath] Sales...<br></div><div dir="ltr">Message-ID:<br></div><div dir="ltr"> <<a ymailto="mailto:63478D7973B325E8.705f0ca1-678b-40e3-b63b-168d099b18be@mail.outlook.com" href="mailto:63478D7973B325E8.705f0ca1-678b-40e3-b63b-168d099b18be@mail.outlook.com">63478D7973B325E8.705f0ca1-678b-40e3-b63b-168d099b18be@mail.outlook.com</a>><br></div><div dir="ltr"> <br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">Non commercial notices pertaining to for sale or wtb Heathkit or Heathkit related equipment are welcome.<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Members are asked to limit for sale notices to one per week.? Multiple items can be listed in a single posting.<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">On Sat, May 19, 2018 at 9:06 PM -0500, "Mike" <<a ymailto="mailto:MLF42@Q.com" href="mailto:MLF42@Q.com">MLF42@Q.com</a>> wrote:<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">Not sure about the "rules" ?so gotta ask...I have some items that might of interest to guys who own HW & SB transceivers. Am I allowed to offer them for sale?<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr"> <br></div><div dir="ltr"> Virus-free. www.avg.com<br></div><div dir="ltr"> <br></div><div dir="ltr"> <br></div><div dir="ltr"> <br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="https://puck.nether.net/pipermail/heath/attachments/20180520/d7b254ef/attachment-0001.html" target="_blank">https://puck.nether.net/pipermail/heath/attachments/20180520/d7b254ef/attachment-0001.html</a>><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 5<br></div><div dir="ltr">Date: Sat, 19 May 2018 22:18:50 -0700<br></div><div dir="ltr">From: ChrisIwata <<a ymailto="mailto:chrisiwata@aol.com" href="mailto:chrisiwata@aol.com">chrisiwata@aol.com</a>><br></div><div dir="ltr">To: <a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a><br></div><div dir="ltr">Subject: Re: [Heath] DSB...<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:5B01053A.70205@aol.com" href="mailto:5B01053A.70205@aol.com">5B01053A.70205@aol.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=windows-1252; format=flowed<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">I don't mean zero carrier DSB, I mean suppressed carrier. In modern <br></div><div dir="ltr">day this amounts to unbalancing the balanced DSB modulator, so that some <br></div><div dir="ltr">carrier is there even in the absence of modulation.<br></div><div dir="ltr"><br></div><div dir="ltr">I'm not talking about the implementation, I'm talking about the signal.<br></div><div dir="ltr"><br></div><div dir="ltr">Yup, I agree controlled carrier AM is much easier to implement. Both on <br></div><div dir="ltr">the transmitting end and the receiving end, compared to DSB.<br></div><div dir="ltr"><br></div><div dir="ltr">Seems to me the signal generated by controlled carrier AM is the same as <br></div><div dir="ltr">suppressed carrier DSB? Neither one has zero carrier with no <br></div><div dir="ltr">modulation, and the carrier increases with modulation. I don't know, <br></div><div dir="ltr">maybe the controlled carrier signal is not a linear representation of <br></div><div dir="ltr">the modulation as is the case with suppressed DSB? That is, if you <br></div><div dir="ltr">speak twice as loud, the controlled carrier might not go up twice as much?<br></div><div dir="ltr"><br></div><div dir="ltr">The one big feature of this signal is it can be detected with a simple <br></div><div dir="ltr">envelope (AM) detector, just like plate modulated AM<br></div><div dir="ltr"><br></div><div dir="ltr">When you think about it, aside from CW, modern ham radio communication <br></div><div dir="ltr">has become very complex. I guess this is why home-brewing is becoming a <br></div><div dir="ltr">lost art.<br></div><div dir="ltr"><br></div><div dir="ltr">Chris, KL7DM<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">On 5/19/2018 4:34 PM, Kenneth G. Gordon wrote:<br></div><div dir="ltr">> OK. I did some research: generating a DSB signal requires a balanced modulator<br></div><div dir="ltr">> somewhere in the system.<br></div><div dir="ltr">><br></div><div dir="ltr">> In one case I remember, the two 1625s in an "ARC-5" transmitter were used as a<br></div><div dir="ltr">> direct-to-antenna DSB transmitter.<br></div><div dir="ltr">><br></div><div dir="ltr">> The screens were fed push-pull audio, while the plates were parallel-connected. As I<br></div><div dir="ltr">> remember it, an oscilloscope was required to get it adjusted properly.<br></div><div dir="ltr">><br></div><div dir="ltr">> DSB is far more complex than the simple controlled-carrier systems in our simple<br></div><div dir="ltr">> transmitters.<br></div><div dir="ltr">><br></div><div dir="ltr">> If anyone here is interested, here is a link to the "Double-Sideband Junior" from GE Ham<br></div><div dir="ltr">> News of March-April 1958.<br></div><div dir="ltr">><br></div><div dir="ltr">> <a href="http://n4trb.com/AmateurRadio/GE_HamNews/issues/GE%20Ham%20News%20Vol%2013" target="_blank">http://n4trb.com/AmateurRadio/GE_HamNews/issues/GE%20Ham%20News%20Vol%2013</a><br></div><div dir="ltr">> %20No%202.pdf<br></div><div dir="ltr">><br></div><div dir="ltr">> Ken W7EKB<br></div><div dir="ltr">><br></div><div dir="ltr">> ---<br></div><div dir="ltr">> This email has been checked for viruses by Avast antivirus software.<br></div><div dir="ltr">> <a href="https://www.avast.com/antivirus" target="_blank">https://www.avast.com/antivirus</a><br></div><div dir="ltr">><br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> Heath mailing list<br></div><div dir="ltr">> <a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a><br></div><div dir="ltr">> <a href="https://puck.nether.net/mailman/listinfo/heath" target="_blank">https://puck.nether.net/mailman/listinfo/heath</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 6<br></div><div dir="ltr">Date: Sat, 19 May 2018 20:04:36 -0700<br></div><div dir="ltr">From: "Kenneth G. Gordon" <<a ymailto="mailto:kgordon2006@frontier.com" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a>><br></div><div dir="ltr">To: <a ymailto="mailto:jerrylofstead@bellsouth.net" href="mailto:jerrylofstead@bellsouth.net">jerrylofstead@bellsouth.net</a><br></div><div dir="ltr">Cc: <a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a><br></div><div dir="ltr">Subject: Re: [Heath] SB-200 and AM<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:5B00E5C4.6833.BC94C58@kgordon2006.frontier.com" href="mailto:5B00E5C4.6833.BC94C58@kgordon2006.frontier.com">5B00E5C4.6833.BC94C58@kgordon2006.frontier.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=ISO-8859-1<br></div><div dir="ltr"><br></div><div dir="ltr">On 19 May 2018 at 23:44, <a ymailto="mailto:jerrylofstead@bellsouth.net" href="mailto:jerrylofstead@bellsouth.net">jerrylofstead@bellsouth.net</a> wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">> Oh yes! Controlled carrier the RF level varies at a voice rate.? DSB SC(supresed carier) was <br></div><div dir="ltr">> produced by putting two tubes in push-push...? usually push pull grids and paralell plates.<br></div><div dir="ltr"><br></div><div dir="ltr">Exactly! :-)<br></div><div dir="ltr"><br></div><div dir="ltr">> Audio was applied to the screen elements. I ran dsb for a few years<br></div><div dir="ltr">> since as a kid, l could not afford a ssb exciter? A Central<br></div><div dir="ltr">> Electronics SB10 OR 20Watt SB 20. <br></div><div dir="ltr"><br></div><div dir="ltr">Central Electronics 10A and 20A. :-)<br></div><div dir="ltr"><br></div><div dir="ltr">>? These were the first available in the <br></div><div dir="ltr">> mid 50s.? DSB SC workrd great.? Google tht CE exciters for early SSB.<br></div><div dir="ltr"><br></div><div dir="ltr">I still have an operational 20A and 455 VFO here. Neat rig. Does 160 meters and CW too.<br></div><div dir="ltr"><br></div><div dir="ltr">Audio sounds superb, BTW. Much nicer than a filter-rig.<br></div><div dir="ltr"><br></div><div dir="ltr">vy 73,<br></div><div dir="ltr"><br></div><div dir="ltr">Ken W7EKB<br></div><div dir="ltr"><br></div><div dir="ltr">---<br></div><div dir="ltr">This email has been checked for viruses by Avast antivirus software.<br></div><div dir="ltr"><a href="https://www.avast.com/antivirus" target="_blank">https://www.avast.com/antivirus</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Message: 7<br></div><div dir="ltr">Date: Sun, 20 May 2018 14:52:21 +0000 (UTC)<br></div><div dir="ltr">From: Glen Zook <<a ymailto="mailto:gzook@yahoo.com" href="mailto:gzook@yahoo.com">gzook@yahoo.com</a>><br></div><div dir="ltr">To: "Kenneth G. Gordon" <<a ymailto="mailto:kgordon2006@frontier.com" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a>>, ChrisIwata via<br></div><div dir="ltr"> Heath <<a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a>><br></div><div dir="ltr">Subject: Re: [Heath] SB-200 and AM<br></div><div dir="ltr">Message-ID: <<a ymailto="mailto:2060329906.3308404.1526827941836@mail.yahoo.com" href="mailto:2060329906.3308404.1526827941836@mail.yahoo.com">2060329906.3308404.1526827941836@mail.yahoo.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">The "generic" term, "AM", normally, to most amateur radio operators, refers to a signal amplitude modulated that has the carrier present.? Of course, FM and PM also have a carrier.<br></div><div dir="ltr"><br></div><div dir="ltr">However, the modes referred to as SSB and DSB are also amplitude modulated signals even though the carrier is suppressed.? ACSB (amplitude companded sideband) is another signal that falls in this realm.? As such, one can say that all "AM" signals are AM but not all AM signals are "AM".? :>)<br></div><div dir="ltr"><br></div><div dir="ltr">That is, all "AM" signals are amplitude modulated but not all amplitude modulated signals are "AM"!<br></div><div dir="ltr">?Glen, K9STH?<br></div><div dir="ltr">Website: <a href="http://k9sth.net/" target="_blank">http://k9sth.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"> From: Kenneth G. Gordon <<a ymailto="mailto:kgordon2006@frontier.com" href="mailto:kgordon2006@frontier.com">kgordon2006@frontier.com</a>><br></div><div dir="ltr"> To: ChrisIwata via Heath <<a ymailto="mailto:heath@puck.nether.net" href="mailto:heath@puck.nether.net">heath@puck.nether.net</a>> <br></div><div dir="ltr"> Sent: Saturday, May 19, 2018 9:05 PM<br></div><div dir="ltr"> Subject: Re: [Heath] SB-200 and AM<br></div><div dir="ltr"> <br></div><div dir="ltr">On 19 May 2018 at 14:48, ChrisIwata via Heath wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">> Is there any difference between carrier controlled AM and suppressed carrier DSB?<br></div><div dir="ltr"><br></div><div dir="ltr">Yes. A HUGE difference. Controlled-carrier AM is, after all, true AM. It has a carrier whose <br></div><div dir="ltr">power level follows the average level of the audio. Essentially, the audio controls the <br></div><div dir="ltr">amount of power out of the amplifier.<br></div><div dir="ltr"><br></div><div dir="ltr">DSB is not AM. I supposed one could call DSB, "AM-without-the-carrier".<br></div><div dir="ltr"><br></div><div dir="ltr">But DSB is far more difficult to implement than CC-AM.<br></div><div dir="ltr"><br></div><div dir="ltr">For one thing, the "simple" methods of generating DSB require two tubes in the final amp <br></div><div dir="ltr">stage, as I remember it. <br></div><div dir="ltr"><br></div><div dir="ltr">I'll go look it up again just to make sure.<br></div><div dir="ltr"><br></div><div dir="ltr">Ken W7EKB<br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"> <br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="https://puck.nether.net/pipermail/heath/attachments/20180520/163eef05/attachment.html" target="_blank">https://puck.nether.net/pipermail/heath/attachments/20180520/163eef05/attachment.html</a>><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">Subject: Digest Footer<br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr">Heath mailing list<br></div><div dir="ltr"><a ymailto="mailto:Heath@puck.nether.net" href="mailto:Heath@puck.nether.net">Heath@puck.nether.net</a><br></div><div dir="ltr"><a href="https://puck.nether.net/mailman/listinfo/heath" target="_blank">https://puck.nether.net/mailman/listinfo/heath</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">------------------------------<br></div><div dir="ltr"><br></div><div dir="ltr">End of Heath Digest, Vol 89, Issue 9<br></div><div dir="ltr">************************************<br></div><br><br></div> </div> </div> </div></div></body></html>