Re: [AMRadio] Comment from N0JEF
When running a transceiver on AM you want to avoid hitting the ALC altogether. This includes the ALC function in the radio as well as the linear. As soon as you trigger the ALC, the carrier level abruptly drops down, producing a distorted, anaemic sounding negative controlled carrier effect. If there is an easy to do so, disable the ALC altogether when running AM. Otherwise, keep the positive peaks just below the ALC threshold. ALC is designed for SSB and was never intended to be run with AM. If the ALC cannot be disabled, it can serve a useful purpose as a positive peak overmodulation indicator. Run the output just under the point where you begin to see some indication of ALC action on voice peaks. The best way to make sure the signal is fully modulated but that nothing is being pushed into the flat-topping/distortion region is to monitor the envelope pattern of the signal with an oscilloscope. At one time, all major manufacturers offered a monitor scope as a matching accessory to go with each of their transceiver lines. A modulation monitor scope is NOT the same thing as a modern transceiver's panoramic display. To me, operating a phone transmitter (AM or SSB) without a monitor scope is like driving a car at night with the headlights turned off. Don k4kyv ___ This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] SDR-IQ audio
I found the issue, it apparently needed a sound card with more guts, installed a mid range card yesterday ($42) ran the audio through the NBFM plug on the 75A2 so I can flop back and forth. It is now similar with a slight difference due to sloping passband Vs near vertical drop on the sdr. all in all at this point, I have to say the issues were self generated and the other interesting features on the sdr are pretty amazing. Maybe I was suffering from a geezer attack!! Turned 73 yesterday, please send all gifts $$$ preferred to QTH listed in QRZ. 73 Bernie W8RPW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] 250TH tube
Who was looking for the new 250TH tube to trade for? Thanks and 73, John, K5PGW __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[AMRadio] Classic exchange
Anyone having any luck? My operating conditions seem to be poor. Heard some worked none. Not even on vhf fm. Most stations heard were on 40. None on 20. Faint on 75. Had better luck running 5 watts on RTTY last night. Worked 4 stations. WY7, in wyoming, a W5, a W6, and a W0. Heard lots of 6's, 7's, and stations all over US and Canada. Also heard Mexico, Venezuela, Cuba, Russia, and a few I didnt recognize. All on 20 meters, ~ have a homebrew ground plane. I didnt hear any SSB/FM cx yet. Will try again on 20 meters when i get back from Wally World in a little while. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] Classic exchange
heard some on 40 ssb and when I tried to call them they told me the frequency was in use. haha go figure. -Original Message- From: Todd Carpenter n9...@yahoo.com To: AMRadio@mailman.qth.net Sent: Sun, Feb 14, 2010 2:53 pm Subject: [AMRadio] Classic exchange Anyone having any luck? My operating conditions seem to be poor. Heard some worked none. Not even on vhf fm. Most stations heard were on 40. None on 20. Faint on 75. Had better luck running 5 watts on RTTY last night. Worked 4 stations. WY7, in wyoming, a W5, a W6, and a W0. Heard lots of 6's, 7's, and stations all over US and Canada. Also heard Mexico, Venezuela, Cuba, Russia, and a few I didnt recognize. All on 20 meters, ~ have a homebrew ground plane. I didnt hear any SSB/FM cx yet. Will try again on 20 meters when i get back from Wally World in a little while. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 250TH tube
At 11:07 AM 2/14/2010 -0800, you wrote: Who was looking for the new 250TH tube to trade for? Thanks and 73, John, K5PGW I also have brand new 250th looking for a home. Dave Wb4IUY www.WB4IUY.net __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] ht20
Hi Greg and thanks for your suggestions with respect to my ht20. I have not been able to check the modulator(807?) yet as I have it in a rack mount and all the rf shields are in place and you know what a bear it is to remove all those screws but I will try to get it done this week and will let you know what I find. But thanks again and hope you are not snowed in. We in Maine have gotten nothing out of those storms. - Original Message - From: Greg Mijal bluebirdt...@embarqmail.com To: n...@securespeed.us; Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 12, 2010 10:44 PM Subject: Re: [AMRadio] ht20 Could you check the modulator voltages and get back to us? Tnx Greg WA7LYO Kinsston NC - Original Message - From: Larry Szendrei n...@securespeed.us To: Discussion of AM Radio in the Amateur Service amradio@mailman.qth.net Sent: Friday, February 12, 2010 11:45 AM Subject: Re: [AMRadio] ht20 Jack Schrader wrote: I hope you remember me, Jack with the ht20. Got the ht20 hooked up and have god output in cw but not am. I hooked up a 100w 210v test light to the antenna output on the ht20 but when I speak into the mic on am the light gets dimmer not brighter. Any idea about that? TnxJack Possibilities: 1) audio out-of-phase 2) insufficient drive to grid of final 3) final not properly loaded 4) insufficient capacitance in filter of HV supply to final/modulators 5) improper impedance match in mod tranny If after checking the obvious and it still occurs, just put it on the air. I have one rig that does this but still sounds quite acceptable. You can look deeper into it later, but have some fun with it in the mean time... Does the modulation envelope look OK on the scope? 73, -Larry/NE1S __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.435 / Virus Database: 271.1.1/2685 - Release Date: 02/13/10 08:43:00 __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [AMRadio] 4D32 sources
Better be quick ... they must have only a few left ... 10 for $165, 32 for $480. -Original Message- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of JAMES HANLON Sent: Saturday, 13 February 2010 4:09 PM To: AMradio Subject: [AMRadio] 4D32 sources Fair Radio Sales, https://www.fairradio.com/catalog.php?mode=viewcategoryid=1420https://www.fairradio.com/catalog.php?mode=viewcategoryid=1420 , lists 4D32's for $17.50 each. Surplus Sales of Nebraska has them for $35 each. In the good old days when they were used in the Viking I and the Korean War made them hard to find, a lot of guys substituted an 829B. My own Viking I that I acquired just a couple of years ago has a very pretty pair of 807's in the final. Jim, W8KGI __ Please consider the environment before printing this e-mail. The information contained in this email and any attachment is confidential and may contain legally privileged or copyright material. It is intended only for the use of the addressee(s). If you are not the intended recipient of this email, you are not permitted to disseminate, distribute or copy this email or any attachments. If you have received this message in error, please notify the sender immediately and delete this email from your system. The ABC does not represent or warrant that this transmission is secure or virus free. Before opening any attachment you should check for viruses. The ABC's liability is limited to resupplying any email and attachments. __ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
