I would also suggest that the Caddock 50 ohm 915 series power film
resistors be considered.
Although these are rated at 15 watts with a heatsink, they are rated for
1.25 watts in free air.
Mounted to the BNC connector with zero length leads, they should be good
up to 500 MHz.
See http://www.caddock.com/Online_catalog/Mrktg_Lit/MP9000_Series.pdf
I use the higher power ratings (on a heatsink) for dummy loads, and they
can be considered 'precision dummy loads' with a 1% tolerance and the
top frequency depends on the lead length and other mounting
considerations. 150 MHz is practical with little consideration for lead
length.
Warning - do not exceed the power ratings or they will 'let the smoke
out' quickly.
73,
Don W3FPR
On 9/13/2014 7:17 PM, Mel Farrer via Elecraft wrote:
Hi Jeff,
Depending on the connector used, and the frequency of interest, I found the
Caddock 1/4 W precision film resistors to be good to about 300 MHz, Try,
RN55D49R9F. (49.9 ohm 1%) . Allied carries them.
Mel, K6KBE
On Saturday, September 13, 2014 12:49 PM, Jeff Herr <[email protected]> wrote:
....50 ohm non reactive 1/4 watt axial lead resistor maybe 1% or better.
I have a couple of old amphenol bnc 240 ohm terminators that I want to
repurpose to 50 ohm.
I am having trouble finding a non reactive part thats good up thru 500mhz.
Jeff Herr, WW6L
4636 Kelton Way
Sacramento, Ca 95838
916.925.6089
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