Bee, I highly recommend the RF Parts matched pair of 3-500ZGs. They have a full one-year warranty, with a pro-rated second year. I have been running mine hard in AM mode and they're still pumping out
Any hint of cost for one of these? Will it be at least in the ballpark of a pair of 3-500s?? Part of the appeal of those tubes is that they're rugged as hell and won't break the bank if you do manage
Are you swamping the Valiant?? That rig does about 150W AM Carrier. That puts your PEP around the 600W level... Isn't that a lot of steam for even a pair of 8877s?? Joe, N3JI ? 200mA of grid-current
As you said, it's already illegal to use them, so what does the extra rule do? Any swingin' CB'er can get a high power amp as it is (ham fests, etc.), so all this does is keep them from buying the **
Hi Roger!! I've been running "Rice Box" AM for some time now, and the trick is to keep the drive below the point that rig distorts. I know that all the manuals say "40W on AM", but I've found that po
Hi Javier, I've seen references to a method of using one of the 80m switch positions to do this, but nothing specific. I imagine it will need a dedicated input circuit and some type of output couplin
You need to keep the RF off the OUTSIDE of the coax. Buy or build a 1:1 Balun (or a "Line Isolator" as they're sometimes called) as Rich suggests below. You can do it by neatly wrapping 15-20 turns o
The one I use has ferrite beads stacked on top of each other (about 50 of the little buggers!!) on about a 12 inch piece of teflon coax. Since it isn't a torroid, it can't be saturated. It's supposed
Good point, Rich!! I guess I should say "DUUHHH!!!". I would imagine that the coax and/or PL-259 would be the weak link in this case though, wouldn't it?? Even say RG-400 or RG-303 would give up befo
You're right, Rich -- bad wording... My point was only that even at 1.5-2kW, the PL-259s or coax they're soldered to would be first to go. I'll stick with my bead balun -- it fixed all the RF problem
Hello Rob, I added auxiliary cooling to my TL-922 and it helped quite a bit. The layout you describe sounds nearly identical to the Kenwood, and I had the luxury of an access panel where the PS strap
I take that to mean 650W PEP, 50% duty cycle for 10 mins. To equate that to AM, 650W PEP is about 150W carrier. But since you have a 150W carrier 100% of the time, does that require further derating?
Having not run one myself in AM mode, I don't know the exact answer. However, I have talked to a couple guys running Johnson Rangers into them and I believe they have to reduce the drive. A typical r
It doesn't say anywhere that I can see, even though it does specify 6kHz @ -26dB for ISB, and 9kHz at -26dB for DSB AM. I asked -- I'll let you know what I find out. Joe, N3JI Joe -- 3kHz wide at how
Here's the scoop, straight from the League: -- Note: forwarded message attached. Also -26 dB, because that's how 97.3(a)(8) defines bandwidth. Dave -- So there you have it: SSB is slated to be define
I suppose you could whistle into it and quickly adjust for max PEP. Once it's done, write down the settings in case you change bands. Most AM'ers are always in the AM Window, so the amp's setting won
Prezactly... Except that it allows wider digital modes in the "CW" bands, and it limits SSB Voice to 3 kHz. I'm not a big fan of this move by the League -- seems silly to put these limits in place on
But that's only if you transmit a full power CW carrier. A keyed amp with no drive at all dissapates less than an amp putting out 300W carrier (DC input power), and less than an amp putting out 1200W
Apparently, I'm one of "these morons". However, be careful not to cast stones when you live in a glass house, because "Bassiness" has nothing to do with the extended BW. Only the high frequencies tak
This is a falacy. My DSP rig does not allow any significant energy in the opposite sideband. However, when there is enough low frequency content, it can sound like a carrier when you tune through the