At 01:11 AM 4/15/04, Vic wrote: I needed a remote (indoor) antenna switching unit, and since I had everything I needed in my junkbox, I decided to build it instead of paying $140+ to Ameritron. I use
I've seen large open frame 30 amp relays overheat at 1500 watts. The low frequency AC or DC switching rating of a relay has almost nothing to do with how suitable it is for RF applications. I have s
I believe the key to handling QRO is in the construction of the relay. Contacts are often just staked to the arms, this makes for poor RF contact. A bit of silver solder works well, probably regular
Please don't take this as argumentative, but I disagree with most of this. I've never seen a problem from contact staking, and can't imagine one occuring. After all, the relay depends on a small cont
Tom: Any thoughts about what things cause the differences you observe? to do with how suitable it is for RF >applications. Tom, how does one read the catalog specifications and somehow decided "that
observe? Sure. When relays are designed manufacturers and engineers don't think about HF signals. Even if they did know the end use, most don't understand what to watch for. somehow decided "that on
<i>Please don't take this as argumentative, but I disagree with most of this.</i> Why am I not suprised? <i>I've never seen a problem from contact staking, and can't imagine one occuring. After all,
distorting the there will be takes is a It has nothing to do with grain struture. It isn't a temper issue. It has to do with expanding the metal in a pressure fit area and then letting it cool, and
Amost all of the interconnects in the ETO Alpha 78 RF deck are made with silver plated copper braid. Most of them are flooded with solder so that they are essentially rigid, but the connections betwe
The difference is important if braid size is limited. If you can use any size braid, then you just size up until the stuff doesn't melt. As for the tube connections, current is pretty low at the ano
Do you think the resistivity of the solder makes any significant difference to the resistivity of the flooded braid, Tom. When I rebuilt the RF deck in W6UE's Alpha 78 (someone cooked the bandswitch
If you're truly interested in reducing the losses and parasitic L, then you could always look into Litz wire. It's available from specialty wire companies like MWS (in Westlake Village, CA) and other
PLEASE, PLEASE, PLEASE take your AMPS pissing contests back to AMPS and quit posting them to TowerTalk. Thank you. Cheers, Steve K7LXC TT ADMIN _______________________________________________ See: ht
I've never used it, so I don't know. The largest problem isn't the resitivity of the materials, it is the construction. Cable manufacturers use special lays of weave to minimize the "in and out" and