[Elecraft] K3 Synchronous AM
Hi everyone. I hope this isn't redundant, but I can not find the answer to it: On the K3, several versions ago of software the synchronous AM feature tracked and locked on to the carrier frequency within at least several hundred Hz. The last several software revisions (beta) do not lock. It works well when I manually zero in on the carrier frequency. Is it me or has that locking on function been removed? 73 Ted W8IXY K3 1717 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 receiving changes since installing latest software
Hi Everyone, Is it just that I haven't read every installment of the reflector, or what? After installing the latest release software, the AM synchronous mode no longer will track and lock onto the carrier. Also, I no longer can get the CW decoder to decode much of anything. The AGC and NR improvements are fabulous. But did something else get broken in the process or may I have broken something? If I am thick headed, I apologize, but is it me or something I missed? Thanks. Ted Alexander W8IXY K3 #1717 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] External T/R switch for the K3, etc.
I have some peripheral neuropathy in both feet, and can not always feel a foot switch. However, I found a neat little plastic box with two push switches already in it on ebay. One switch is momentary, one is latching. Good for quick break in or longer winded transmissions. Cost was less than $14, including shipping. I was thinking of replacing the switch cap of the momentary switch with a mushroom switchcap for even greater ease for break in operation. 73 Ted W8IXY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Audio Processing
I designed the processing parameters of the Omnia ONE AM broadcast processor, and have spent almost a half century adjusting broadcast audio. My suggestion is to apply a sensible amount of compression and limiting to increase the perceived loudness level to the maximum amount the equipment is capable of and STOP THERE! Adding more just muddies up the sound. We should aim for a balance between ultimate loudness, as well as sensible EQ to enhance intelligibility, and depth of processing. Specifically, for speech processing on the ham bands, you MUST start with a good microphone. I have found that using about 7 - 10 db compression with a 3:1 compression curve, followed by 3 - 6 db of hard limiting, maximizes the perceived loudness, without reducing intelligibility. In broadcast, 1 or 2 db of clipping will add a little bit more punch, but cranking the clipping up more than that passes the point of usefulness quickly. Additionally, the transmitter should faithfully reproduce the audio sent to it. Any additional distortion or EQ applied AFTER processing usually results in a significant deterioration of the desired audio. We hear a LOT of that on the air these days. To my ear, a well controlled but not overblown audio signal is both the easiest to listen to for long QSO's, but also has the punch to get through in crowded and/or weas signal conditions. 73 Ted W8IXY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] Elecraft Digest, Vol 74, Issue 16
Regarding the WKYC, Cleveland TV transmitter: I can see the WKYC tower from my front window, about 2 miles from my QTH. WKYC ended digital channel 2 transmission on June 12, 2009. I was standing next to the digital channel 2 transmitter when they pulled the big switch. Until then, because of my proximity to their tower, most of 6 meters was hash. They had an interim 10kw ERP on RF channel 2. With the sunset of analog TV, WKYC moved to RF channel 15, and 6 meters was quieter that it had been for several years at my home. There are a few digital RF channel 2 transmitters still operating, and anyone within several miles of them will have some hash on the upper end of 6 meters. Even though the out of band digital hash needs to be down some 80 db, 80 db down from 10kw ERP from an antenna 1000 feet above average terrain is still plenty of signal to wipe out weak signals on 6. 73 Ted W8IXY - Original Message - From: Joe Subich, W4TV li...@subich.com To: Mike WA8BXN hubb...@hotmail.com Cc: elecraft@mailman.qth.net Sent: Sunday, June 13, 2010 1:24 PM Subject: Re: [Elecraft] Intermod or mixing? I would suggest going to the individual web sites for stations that are shown as being on channel 2 to see where they really are now. Some stations may have moved away from low VHF licenses but there are as many who have active applications and/or construction permits to move back to low VHF. The issue is lack of coverage due to bad model data that resulted in excessively low equivalent coverage ERP. 73, ... Joe, W4TV On 6/13/2010 12:43 PM, Mike WA8BXN wrote: Some careful reading W9WI data may be in order. For example, from the WKYC (analog channel 3) web site: July 12, 2009: Channel 3 moves to all digital broadcasting on digital channel 17 at 10 a.m. (Previously, the station was broadcasting on digital channel 2.) The station would continue its analog broadcast as the nightlight station in Cleveland, broadcasting only transition information through July 26th when the analog transmitter was permenantly shut off. I would suggest going to the individual web sites for stations that are shown as being on channel 2 to see where they really are now. 73 - Mike WA8BXN __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 on AM with AL811H amplifier
Just thought you'd all like to know that I have been getting GREAT AUDIO reports from running K3 #1717 on AM, into an AL811H amplifier driving the amp to about 125 watts carrier. Connecting the K3 to the amp was as simple as plugging in the relay cable and the coax. Running AM and using the sync detection on AM surpasses even my old boat anchor AM receivers. For me, the K3 is the true all purpose radio. 73 Ted W8IXY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] AM broadcast HD noise on K3 synchronous reception mode
I have been experimenting with the K3's synchronous AM feature and was wondering about why I am hearing a background roar whenever I tune in an AM broadcast station that is running HD. The roar is not something supersonic, but is heard right through the audio that runs from 30Hz to 5kHz. I am a broadcast engineer dealing with AM transmitters, and am familiar with the AM HD transmission techniques. The HD sidebands are located approximately 6 to 17 kHz removed from the carrier, are about 20db down from the carrier, and when detected on an AM envelope detector, are heard as a hiss. I was thinking that if the K3's bandwidth was narrowed to less than 6 kHz, using both the 6 kHz roofing filter and the DSP filtering, the digital HD sidebands would simply be unheard since they would fall outside of the bandwidth of the receiver. Using the K3 in standard AM mode, thats just what happens, you hear no roar underlying the detected audio. However when switched to either synchronous mode or USB or LSB in SSB mode, those HD sidebands appear to be causing that roar in the detected audio. That also got me to wondering what effects other spurious signals near an AM (or SSB) signal would be audible or detectable as noise or any other artifact in the detected audio. Has anyone else found this to be happening on their K3's in synchronous AM or SSB modes? Ted W8IXY _amf...@aol.com_ (mailto:amf...@aol.com) __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] Regulations
Ladies and Gentlemen of the Elecraft Reflector: Please be careful what you wish for and/or petition for. How great of a service the Amateur Radio hobby would be if we all had type approved radios, requiring a yearly checkout at a licensed measurement office ($500 per radio, per band, per mode), channelized frequencies so we would all be within 50Hz of a designated center of channel, a single mode of approved operation, radios so simple no one would need to have any knowledge of how to operate the thing, etc., etc. Wow! Thats like living in an HOA dwelling! And, the greatest thing of allsince no one would need to know how to make his radio meet all spectral purity and emissions tests, WE WOULDN'T NEED ANY LICENSES! Frequencies waiting to be used by ANYONE! CB everywhere (gasp). Please! Be vewwy vewwy careful for what you wish. 73 Ted W8IXY K3 #1717 __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] K3 transmit and receive audio response
Hello everyone,
I had a chance at Dayton this year to chat with the Elecraft honchos,
and had every one of my K3 questions answered. Thanks, gentlemen.
Meanwhile, a few hours ago, Wayne had written:
{While I'm on this topic, I'd also like to suggest using a minimum of
both RX and TX EQ. The '0' levels were carefully determined
empirically, and in most cases the optimal values will be well below
the maximum range provided. Unless you have an aural sensitivity issue
in some pitch range, or a serious mic deficiency, I'd stay between +/-
6 dB. As with filter gain settings, excessive values can result in
adverse interaction with the DSP.}
What I would like to know is just what the ACTUAL response curves of
the K3 transmit and receive audio are (when all EQ settings are set to
'0', since Wayne stated: The '0' levels were carefully determined
empirically. It would appear from this statement that setting the
EQ's to '0' wouldn't necessarily result in a 'flat' response.
I design parameters for some broadcast audio processors (Omnia's)
and just am curious (and picky) what 'flat' actually is when the EQ's
in the K3 are all set to '0'. And, for transmit, is the internal RF
speech processor applied pre or post of the frequency response
shaping circuitry?
Thanks 73.
Ted W8IXY
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Re: [Elecraft] K3 aux receive antenna input
Hello! I don't plan on installing the second receiver in my K3 as my operating habits don't require it, but I was wondering if there are any future plans to include a receive only antenna option for K3's without the KRX3?? That I could use very nicely with a broadband amplified short antenna. Thanks!?? 73. Ted Alexander? W8IXY __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
[Elecraft] AGC reverts to slow when engaging auto tune function in v 2.67
Hi everyone, I loaded V2.67 into my K3 (#1717) a week ago and just noticed a problem. Whenever I tap the auto tune function, at soon as the auto tuner finishes matching the load, when the K3 receiver returns to life, the AGC release time is SLOW. Even though the front panel indication is AGC-F (and the indication does not change when auto tune is tapped), the response timing is the same as AGC-S. Then when I tap the AGC button to set it to SLOW, then tap it again to set it to FAST, the AGC then returns to FAST. Has anyone else found this? Ted, W8IXY _amf...@aol.com_ (mailto:amf...@aol.com) **One site keeps you connected to all your email: AOL Mail, Gmail, and Yahoo Mail. Try it now. (http://www.aol.com/?optin=new-dpicid=aolcom40vanityncid=emlcntaolcom0025) ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
