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Texas Star Linears on the amateur bands?

The 667 is a goob job.
There is no need for a driver in front of 4 2879's.
I have been using a Texas Star 500 on 10 and 12 meters for decades at the 340/360 watt levels on SSB and have never gotten a complaint about my signal.



My nickels worth.

73
Jeff

The 500 is one of the more linear amps according to texas star's chart. Since you are running it at a reasonable output it's probably ok. Most people would want the full 500 and then some.

There are some guys locally that have tech tickets that use their cb stuff on 10m. That's ok, but their radios are hacked up and they think 38lsb is what ssb is supposed to sound like. Their audio is fatiguing to listen to and signals look like double sideband on the waterfall. Splattering 20kc wide. If 10m wasn't such a ghost town they would probably be on a YouTube video.
 
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543 your posting is correct.
Most CB guys think if it says 500 on the front it should do 500 watts, or more, not knowing the limitations of the equipment they have.
I started this hobby on CB as well.
When I first got into radio a long time ago I did not understand much about the tech aspects of radio.
Early on I also ran a splattered station before it was pointed out to me that my signal was as wide as a semi truck.
I learned.
We need to help newbies learn and understand.
Sometimes it is like banging your head on a wall but a few will get it and it is worth it in the end.

That is one of the reasons this forum is here.

I am happy to see guys on 10 meters, and am happy to talk to them and try to offer suggestions to help them operate a better station.
I treasure 10 meters, it is ( to me anyway) one of the best bands we have as hams.
Look how big it is.
Space for every mode under the sun and the propagation is out of this world.
Antennas are manageable on this band and equipment can be relatively cheap when compared to other options.
I fear that some day someone will try to take it away from us because we don't use it enough.
Anyway , back on Topic.
As far as solid state CB style amps go there is much worse than the Texas Star models.
I still stand by my old statement that the 500, if run conservatively, not overdriven, not overvolted, is about the best plug and play commercial amp you can get for 10/12 meters.
The cost is now skyrocketing because of the transistors.
If you bought from a wholesaler in the past the cost per unit was not that bad.

You know it is a bit odd that the FCC will let these be sold as CW transmitters openly when everyone knows dam well what they are used for.

Palamar, many years ago built the TX 5300.
It had 4 Motorola transistors in it , a band switch that functioned and band pass filtering.
That is the only solid state CB style amp that I have ever laid eyes on that went that far.
There were also a couple Palamar models that had temperature compensated electronically regulated bias, also some TX and Magnum models.
Just about everything else is cobbled together, cheap dirty amps with the minimal amount of parts to function.
Some of the RM amps are not too bad if driven at low levels and not overvolted.

73
Jeff
 
I often wondered how low in the HF bands you could take one of these amplifiers before its output started to deteriorate. There aren't any tuned circuits or filters anywhere so its going to be a matter of the inductance and core materials used in the transformers, combiners, and splitters.

Another very nice amplifier like the old TX 5300 was the Yaesu FL-110. It was FCC certified with an RF keying circuit and bandswitch.
 
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I think Toll Free said he could get down to 80 meters one time, but I am not sure what amp it was.
Might have been a highly modified Messenger.
I miss seeing him around the forum.

73
Jeff
 
I've been tempted to retune the lc network in a comp 8 or 16 pill for 75 meters. Puresignal would straighten it out for AM use. Possibly ssb.

I don't know why more manufacturers haven't started using adaptive predistortion. I have watched a friend toggle it on and off with a splatter box amplifier and it made his signal one of the cleanest on the band.
 
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I think Toll Free said he could get down to 80 meters one time, but I am not sure what amp it was.
Might have been a highly modified Messenger.
I miss seeing him around the forum.

73
Jeff


I have an old 2x 2SC2879 amp here somewhere and I remember driving it all the way down to 80m. The gain was stupidly high down there compared to 10m. I never put it on the air however just into a dummy load one day I was bored and wanted to "see if".
 
If it was 3.810...I wouldn't follow tech advice learned there unless you did a lot of work on your own to find out why it was bad advice before following it ;-).
I even started asking similar questions right here when I first got started so I'm no hypocrite, I just know better now.

Technical advice is only as good as the verifiable training behind it.
 

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