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 governmental or research-based chirpi
Their reed relays are plenty fast enough and I see no real benefit over PIN diode switching except for longevity. Still, few relays fail in these rigs even after 20+ years. I did replace the T/R rel
The Omni 6/6+ also uses a handful of 1N4007 diodes as part of the T/R circuit, particularly for the 2nd Rx port. However, isolation characteristics are not nearly as good as a true PIN diode structu
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 early '90s. Quite a few folks took advantage of it and
The mechanical mounting of a T/R relay has a profound effect on acoustical noise. To reduce noise of any relay in a T/R circuit, the idea is to reduce the effects of the PCB or chassis functioning a
I need to correct myself. That should have read Matsushita/Aromat RSD-12V. Tnx. Paul, W9AC _______________________________________________ TenTec mailing list TenTec@contesting.com http://lists.cont
The Microsemi UM2110 was selected for its voltage handling capability (1 KV DC), rather than its power handling. Recall that the very first Omni Sixes suffered from poor port isolation (~ 30 dB). Th
are relay Tell us a bit more about the type of amp you're trying to interface and your level of comfort with soldering/de-soldering a couple components inside the rig. I can guide you through this,
and the amplifier. The relay in the amplifier is quite noisy, however when i'm not using the amp, the relay in the rig seems to be quite loud. Since i have the isolation relay at the power supply to
Good solution, but the extra circuitry required within an older non-TT amp to establish a keying loop is beyond the means of most users. The sampling of the Omni Six's "T" buss results in the closur
filter in front of the Omni VI+. Has anyone encountered or heard of a similar UHF intermod problem with the Omni VI? Jack K1VT" Déjà vu. I ran into the exact issue back in '92 when I p
But what I did not do in the 13 years thereafter was to check for the problem after the PIN diodes were installed. The Viking filter was so unobtrusive that it just stayed there, out of sight, out o
Terry: It's been a while since I've owned an Omni 6, but removal of Plug 52 should have no effect on pilot lamp brightness. Removing the plug disables the side-tone wrap-around circuit -- a cause of
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
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
Joe: If you check the TT archives from about 10-12 years ago, you'll see plenty of my posts on this subject. I spent about six months searching for the problem and ultimately came up with a solution
Don, First, not every Omni VI/VI+ exhibits the chirp phenomenon -- either through evolutionary changes, or component tolerances that allowed some Omnis to sound just fine. Next, check your data as it
Joe, I would experiment with both EPROMs and use the one that works best for you. If you are satisfied with the sound of the transmitted CW tone, then I would leave it alone. You may find that after
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