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121. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 17 Feb 2008 11:23:14 -0500
I am wondering if others have received similar reports and if anyone has changed the keying waveform on the OMNI VI. Joe: If you check the TT archives from about 10-12 years ago, you'll see plenty of
/archives//html/TenTec/2008-02/msg00215.html (11,419 bytes)

122. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 17 Feb 2008 18:57:17 -0500
Don, I understand T-T changed the transmit audio/BFO board crystal frequency adjustment from 9.000700 mHz to 9.000400 mHz. Apparently this was done as part of eliminating the small chirp. First, not
/archives//html/TenTec/2008-02/msg00226.html (11,871 bytes)

123. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 18 Feb 2008 09:24:15 -0500
Well it seems that Don is very happy with the Logic EPROM version 1.02 solution, but Paul says it only partially masks the problem at the expense of QSK. What is the effect on QSK? I guess I will jus
/archives//html/TenTec/2008-02/msg00236.html (10,494 bytes)

124. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 18 Feb 2008 13:09:02 -0500
Don's input helped to shake some cobwebs loose... TT initially shifted the CW BFO from the USB crystal. Then, I believe in an effort to help eradicate the chirp, a later design shifted the LSB crysta
/archives//html/TenTec/2008-02/msg00256.html (11,403 bytes)

125. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 19 Feb 2008 07:13:56 -0500
To answer Carl's question, there is a problem with keying, but I would not call it chirp. I do not hear a change in frequency across the cw dot or dash. I do not like the sound of what I hear. Joe, I
/archives//html/TenTec/2008-02/msg00301.html (9,842 bytes)

126. Re: [TenTec] OMNI VI Chirp Report (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 24 Feb 2008 17:10:08 -0500
Joe, As long as you're happy, that's really all that matters. Glad you were able to close out the trouble ticket. Paul, W9AC Well the matter of alleged chirp in my OMNI VI+ has finally reached a happ
/archives//html/TenTec/2008-02/msg00411.html (11,076 bytes)

127. [TenTec] 40M Band Sweeps (Request) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 12 Jan 2008 10:30:00 -0500
Last month, I sent the message below concerning an increased level of strong-signal 40M band sweeping at all hours of the day. At first, I thought these sweeps were local given the extremely strong i
/archives//html/TenTec/2008-01/msg00229.html (11,991 bytes)

128. Re: [TenTec] 40M Band Sweeps (Request) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 12 Jan 2008 14:11:22 -0500
Ron, You're right. It would take quite an effort to have anything done. There would be few people, if any, in Congress who would support a measure that in any way diminishes the effectiveness of this
/archives//html/TenTec/2008-01/msg00244.html (15,910 bytes)

129. Re: [TenTec] 40M Band Sweeps (Request) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 12 Jan 2008 22:00:59 -0500
What is the special software package so that others of us may attempt to locate these transmitters? http://www.dcs.lancs.ac.uk/~senior/chirpview.html Paul, W9AC
/archives//html/TenTec/2008-01/msg00269.html (7,808 bytes)

130. Re: [TenTec] relay delay in Tentec QSK amps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 07:03:12 -0500
It's also very easy to add diode summing networks to combine the keyer with the computer keying line (like the K2 does). I build these networks into the output of the keyer (which comes with several
/archives//html/TenTec/2007-12/msg00142.html (10,487 bytes)

131. [TenTec] 40M Band Sweeps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 07:17:08 -0500
Not exactly related to TT, but since so many TT users operate on 40M, I'll throw this out... I have been noticing an alarming amount of band sweep activity lately. It occurs where someone keys their
/archives//html/TenTec/2007-12/msg00143.html (9,534 bytes)

132. Re: [TenTec] 40M Band Sweeps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 15:42:56 -0500
experiments, or other the horizon radar. There used to be an HF facility in Eastern Canada that intruded on the ham bands from time to time. And, it might be military related, depending on what stre
/archives//html/TenTec/2007-12/msg00166.html (10,085 bytes)

133. Re: [TenTec] 40M Band Sweeps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 17:43:33 -0500
Tnx Stuart. Rx location is Jacksonville, FL. Paul, W9AC Paul, Where is the receiver located that is hearing the sweeps? I might be able to devine some info from our RF section researchers. I know our
/archives//html/TenTec/2007-12/msg00173.html (10,112 bytes)

134. Re: [TenTec] 40M Band Sweeps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 20:21:04 -0500
One of the world ionosonde sites is listed for Eglin Air Force Base. That would be possible you are hearing them on 40m. Stuart, Good info to share. Tnx! Paul, W9AC
/archives//html/TenTec/2007-12/msg00182.html (9,742 bytes)

135. Re: [TenTec] 40M Band Sweeps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 6 Dec 2007 22:32:02 -0500
Is it limited to 7.0 - 7.3 MHz? No, I now see that is it much broader than just 40M. From my location, signal strength is about +35/S9 at any time of day. So, it does appear to be some form of govern
/archives//html/TenTec/2007-12/msg00192.html (9,548 bytes)

136. Re: [TenTec] OMNI VII QSK users with good ears.... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 9 Dec 2007 10:18:18 -0500
I'm trying to think of a modern Ten-Tec radio that doesn't use a relay for T/R switching, and can't think of one! Their reed relays are plenty fast enough and I see no real benefit over PIN diode swi
/archives//html/TenTec/2007-12/msg00295.html (10,761 bytes)

137. Re: [TenTec] OMNI VII QSK users with good ears.... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 9 Dec 2007 14:02:26 -0500
I believe the Argo V DOES use diode switching. The pin diodes used are exotic 1N4007. The Omni 6/6+ also uses a handful of 1N4007 diodes as part of the T/R circuit, particularly for the 2nd Rx port.
/archives//html/TenTec/2007-12/msg00303.html (10,558 bytes)

138. Re: [TenTec] OMNI VII QSK users with good ears.... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 9 Dec 2007 18:45:21 -0500
Where does one obtain those UM2110 diodes? Dj k6rcl At one time, Microsemi would "sample" them out to hams, in addition to their usual commercial and military customer base. That was back in the earl
/archives//html/TenTec/2007-12/msg00312.html (11,065 bytes)

139. Re: [TenTec] OMNI VII QSK users with good ears.... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 9 Dec 2007 20:07:32 -0500
The Omni VI/VI+ used a reed relay for T/R switching, even tho they may have used diodes in the circuit. Remember all the complaints about how some folks could hear their relay and others couldn't? :-
/archives//html/TenTec/2007-12/msg00316.html (11,799 bytes)

140. Re: [TenTec] OMNI VII QSK users with good ears.... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 9 Dec 2007 21:15:02 -0500
I did replace the T/R relay in my Omni VII with a Matsushita/Aromat RS-12D reed relay, made specifically for RF switching. I need to correct myself. That should have read Matsushita/Aromat RSD-12V. T
/archives//html/TenTec/2007-12/msg00323.html (10,158 bytes)

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