[AMRadio] Sorta OT but just wondering about RF termination resistors.

[donroden at hiwaay.net]

QST has a building a dummy load article in the last couple of months.

something like 12 600 ohm thin-film resistors @ 50 cents each

and two 50 ohm resistors in parallel = 25 ohms

two 25 ohm pairs is series gets you back to 25+25=50 ohms

Don W4DNR


Quoting Randy Berry <randyn3lrx at gmail.com>:

> Hi,
> I'm looking to buy some RF Termination Resistors off fleabay to make a
> dummy load. ( https://www.ebay.com/itm/113540911710 ) MFJ claims to
> make 2.5K one using 4 50 Ohm resistors (don't know the input rating of
> them, they don't say.)
>
> But how could they use 4 50 Ohm resistors? In parallel that would be
> roughly 12 Ohms, in series 200 Oms. Just wondering how I could use 2
> of the fleabay resistors to make a 300 watt dummy load without
> changing the resistance. As far as I know it's not possible unless I
> make a splitter to divide the power into 2 loads and send 150 watts
> into each load. They resistors are cheap enough and I have more than
> enough heat sink material.
>
> I doubt I'll be running more than 50 watts VHF and 25 watts UHF but
> the headroom would be nice in case I do get an amplifier.
> --
> tnx es 73 de Randy, N3LRX/8
> https://n3lrx.com
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