T1 at 35W?
Locked
 
|
Hello All,
So I am getting a little 35W amp for the Softrock 6.2 I have on order. Will I have problems if I use my 20W T1 at 35W? I plan to do CW, SSB, and digitial modes. Anyone else tempting the fates on the T1? Thanks, Kurt - ae6uj ____________________________________________________________________________________ Building a website is a piece of cake. Yahoo! Small Business gives you all the tools to get online. http://smallbusiness.yahoo.com/webhosting _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
Kurt,
The real answer is that it all depends on the RF voltage maximum that the T1 will see - and that depends on the band, your antenna and the feedline. There can be no positive or negative answers unless all the parameters are known - Antenna impedance at each operating frequency and length and type of feedline at are critical to how much RF voltage the T1 must handle. What will work for one set of conditions may not work for another. I doubt that the T1 will handle 35 watts in the general case (that is why it is rated for 20 watts) - you may be able to use it at 35 watts under carefully controlled conditions, but if one must go to all that trouble, why not just switch to resonant antennas with a 50 ohm feedline and no tuner required? 73, Don W3FPR Kurt Loken wrote: > Hello All, > Mime-Version: 1.0 > Content-Type: text/plain; charset=ascii > > So I am getting a little 35W amp for the Softrock 6.2 I have on order. > > Will I have problems if I use my 20W T1 at 35W? I plan to do CW, SSB, and digitial modes. > > Anyone else tempting the fates on the T1? _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Kurt Loken
I just got a T1 a few days ago. Tried it at 35 watts (an HF Packer
amplifier) and so far no ill results. This is driving the amp. with a K1 at about 2 watts on CW only. The T1 has far greater range than the KAT1 internal coupler. 73, Sandy W5TVW ----- Original Message ----- From: "Kurt Loken" <[hidden email]> To: <[hidden email]> Sent: Wednesday, June 06, 2007 10:24 AM Subject: [Elecraft] T1 at 35W? > Hello All, > > So I am getting a little 35W amp for the Softrock 6.2 I have on order. > > Will I have problems if I use my 20W T1 at 35W? I plan to do CW, SSB, and > digitial modes. > > Anyone else tempting the fates on the T1? > > Thanks, > > Kurt - ae6uj > > > > ____________________________________________________________________________________ > Building a website is a piece of cake. Yahoo! Small Business gives you all > the tools to get online. > http://smallbusiness.yahoo.com/webhosting > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.472 / Virus Database: 269.8.9/834 - Release Date: 6/5/2007 > 2:38 PM > > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
I just got a T1 a few days ago. Tried it at 35 watts (an HF Packer
amplifier) and so far no ill results. This is driving the amp. with a K1 at about 2 watts on CW only. The T1 has far greater range than the KAT1 internal coupler. 73, Sandy W5TVW ------------------------------------ The reason the bridge circuit in there has a double-stacked toroid on one side was that Tom, N0SS, tried something like 40 watts into his original beta-test unit and it worked except for that core getting hot enough to blister a finger. Two cores help avoid saturation at all power levels. So, if you're pushing the power limit, checking the temperature to the bridge circuit toroids (near the connectors - the ones with a single turn wire primary) will tell you if the smoke is about to escape <G>. Obviously the danger is in overheating and fracturing a core. That can happen among the other cores too, depending upon the impedance the antenna presents. If it's showing a low impedance (current loop), enough current may flow to saturate a core in the L-network. The symptom of that happening is that the tuner will find a nice match at low power then, as the power is increased, the SWR jumps up high when the current increases enough to saturate the core (or the core heats enough to reach its curie temperature). That causes the inductance of that coil to change, throwing the system out of tune. Of course, over time, one might also experience damaged relay contacts from excessive current when feeding low impedances or arcing due to high RF voltages when feeding high impedances. Since that all depends upon the impedance the antenna presents and the actual RF power, individual experiences will vary a great deal. As usual, Elecraft is pretty conservative in their ratings, but that's done for a reason. At 20 watts, any impedance the T1 will match won't do any damage to the tuner no matter how long it's used. Ron AC7AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
«
Return to Elecraft
|
1 view|%1 views
| Free forum by Nabble | Edit this page |