If you can use the radios power control to reduce output to the 20-25W
range, I've found this to be a simple, cheap and effective solution. I use
one of these on a IC-706. I dial down the power and use a external ALC
circuit to control the "overshoot" common to this line of radios.
http://transverters-store.com/attboard.htm
Jay W9RM
DM58 CO
Keith J Morehouse
Managing Partner
Calmesa Partners G.P.
Olathe, CO
On Sun, Feb 5, 2017 at 8:43 AM, Steve Kavanagh via VHFcontesting <
vhfcontesting@contesting.com> wrote:
> Paul
>
> Just one more approach....if you can source ordinary resistors at a good
> price you can build your own power attenuators for 28 MHz quite easily. It
> looks like 100 1 watt resistors would be around $30 from Digi-key, maybe
> 1/10 of that from Chinese vendors on Ebay. Each resistor is probably
> somewhat inductive at 28 MHz, but with enough in parallel the inductance is
> divided by the number of resistors and becomes pretty much negligible.
> Here's a 100 W (or so) dummy load using that approach - the SWR is great on
> 10m, but not so good on 6m:
>
> http://www.qsl.net/ve3sma/HFDummyLoad.pdf .
>
> Occasionally I think about converting it into an attenuator, but haven't
> gotten around to it yet.
>
> 73,
> Steve VE3SMA
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|