Gary: Thanks for the manual citation. I don't know how I missed it. Tom Behler: KB8TYJ ----- Original Message ----- From: "Gary Lee" <[log in to unmask]> To: <[log in to unmask]> Sent: Sunday, December 30, 2012 12:32 PM Subject: Re: More on interfacing Cobra Ultralite Senior with Tentec 238A manual tuner > =46rom the manual section provided, this is a typical t type tuner with = > a built-in balun. > No other balun necessary or desirable. > > Gary Lee > [log in to unmask] > > > > On Dec 24, 2012, at 1:16 PM, Tom Behler <[log in to unmask]> wrote: > >> Hi, again all. >>=20 >> My apologies: >>=20 >> I should have given more complete info in my last post. >>=20 >> First of all, the Tentec 238A is rated for up to 2000 watts, so I = > would >> think I'd be ok in that regard, since the most my Ameritron AL811H = > puts out >> is about 600 watts. >>=20 >> Second, here's a more complete set of instructions about antenna >> connections: >>=20 >> For balanced feedline systems, adding a=20 >> jumper from SINGLE WIRE to one of the=20 >> BALANCED LINE terminals as shown on the=20 >> rear panel is required. A tin-plated steel=20 >> jumper for this purpose has been provided.=20 >> It is attached to one wing nut connector on=20 >> the back; if balanced line will be used, attach=20 >> the other side of the jumper to the other=20 >> wing nut. Then connect the feedline to the=20 >> two BALANCED LINE terminals.=20 >> ANT position 4 can be coax, single wire, or=20 >> balanced line. ANT 1, ANT 2, ANT 3 must=20 >> be coax only.=20 >> Please note that 238C does NOT allow for=20 >> the connection of either coax-fed and=20 >> balanced line or single wire antennas to the=20 >> ANT 4 connection at the same time. There=20 >> is no switchable configuration for ANT 4 -=20 >> any antennas connected to these jacks will=20 >> be in use. If you have a coax fed antenna=20 >> and a balanced line or single wire antenna=20 >> connected to ANT 4 at the same time, both=20 >> of these antennas will be in use when ANT 4=20 >> is selected from the front panel." >>=20 >> In light of this new info, would I still be ok without the Balun = > Designs >> balun, as far as anyone can tell? >>=20 >> On the negative side, would using just the tuner and the antenna = > without the >> additional Balun Designs balun possibly lead to more stray RF in the = > shack? >>=20 >> 73 from Tom Behler: KB8TYJ >