Topband: [Bulk] alternative feedpoint capacitor

[Grant Saviers]

I found NOS Soviet block screw mount micas on ebay that looked like they 
would handle QRO and have three pairs in series to cover the band with 
shorting relays - all shorted = 1820 then each step (2 short, 1 short, 
all open) adds 50KHz.  85' to top, 2x 30' hat and 8 10' elevated 125' 
radials.  So far no problems.  Relays are PCB 8a, 5KV coil isolation, 
they only see 350v or so and never hot switch. Ok so far, up 2 years but 
I think the top is a little too close to the tree.  The tree guy will 
fix that next visit.

Grant KZ1W

On 8/2/2015 17:10 PM, Steve Flood wrote:
> My top-loaded vertical needs a series 260pF capacitor at the feedpoint to
> match the 53 + j335 impedance (1.825 MHz) to my coax feed.
>
> I have a few different air-variables I could use, but I was wondering what
> sort of fixed capacitors would be suitable in this application.
>
> Max power is 1500w.  I have doorknob caps but they don't have current
> ratings marked on them.
>
>   
>
> Thanks,
>
> Steve KK7UV
>
>
>
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