Hi all... I have recently purchased an old Ten Tec L network ant tuner..the one that was in kit form many years ago. I have noticed that when feeding it to a 22 ft elevated ground plane on 80 meters
Are you using the ferrite balun? If so, check its temperature too. The stock balun in the this tuner is very unforgiving. When I built this tuner back in 1985, I smoked the balun almost immediately w
The feed impedance of that short antenna is much too low. You are going to melt down your tuner. Any tuner will get hot and consume a large percentage of your RF power when attempting to match such a
Got a couple of nice replies right off the bat...should of added more specifics.. I am running barefoot at 100 watts..no amp in the place I am not using the internal balun but was using a 4:1 current
Good advice, Steve. Some form of capacitive top loading (top hat or even a single horizontal wire) will raise the feedpoint R too. Mike, W4EF.......................... percentage 4:1 anyway). get occ
Mike. I started to reply with a barage of antenna information and caught myself before I went off the deep end. Just let me conclude that: 1. That vertical is not balanced so forget about baluns. (Yo
What I was originally trying to determine is why the older tuner would have swr drift while the new one didn't. I feed the base of the verticle with a 2:1 balun running in reverse...then to 450 ohm t
Information keeps leaking out. What's this about an "older and newer tuner"? What are they? Steve N4LQ -- Original Message -- From: "denton" <denton@oregontrail.net> To: <tentec@contesting.com> Sent:
The older tuner is a Ten Tec 4229..the kit form of a 229 tuner. The newer one is a Ten Tec 238A tuner...same as the new ones except the paint job it a bit different. -- Original Message -- From: "Ste
It must have components that are more tolerant to heat. This is all moot since you're not going to transmitt with it anyway. Steve N4LQ -- Original Message -- From: "denton" <denton@oregontrail.net>
The change in meter readings is most likely due to excessive current flowing through the fixed capacitors, which is causing their capacitance to change. Same is true of ferrite material, and ferrite
No, not necessarily true. Normally a blanket statement like this wouldn't bother me at all, but to say that "Any tuner will get hot and consume a large percentage of your RF power" demands a little
Very good Al..I am the originial poster.. I was merely inquireing as to why one L network would have swr drift while another later model L network would not under some circumstances. I will query Ten
Hello, Original Poster, Well, I am guilty of the same offense that seems to plague almost every question posted here... I didn't answer the original question. Good idea to call Ten Tec. They may tel
I just bought a 238B and noticed that the schematic shows two 220pF in parallel for each stage of added capacitance to be switched in with the Low Z - High Z switch. In the parts list, they show what
Depending upon how often the network has to tune an impedance with a very low R component, it may be worth the effort and expense to replace the ceramic disk caps with something more robust, like an
Doug, W9CF has an interesting java applet that calculates T-network tuner losses for an arbitary load impedance. You can adjust the component Q in the program setup and then examine what effect that