* +23dBm is still a lot less then some of the lightning transients
you normally get during a thunderstorm. I use a 200W lightning
protector in my antenna line on the F5K and 20W protector on the
F1.5K.
* The input impedance on rx is not usualy defined (the tx is). It
often is 500-2000 Ohm I believe, so the 50 Ohm dummy.
* Not sure if the dB scale will handle positive numbers
* The Pad trick is likely to do the job. May have to use a couple in
series.
On 12/5/2012 9:08 PM, Brian Lloyd wrote:
On Wed, Dec 5, 2012 at 5:42 PM, John Vandenberg <[email protected]
<mailto:[email protected]>> wrote:
I just build a small WSPR kit. I like to verify the power out,
but my power meter does not go that low. It is supposed to output
about 150mW.
If I use a T connector and hook it up to the dummy load and the
Flex-5000 will that work? Will it damage the Flex? Please some
advice.
That is +23dBm and that is very likely to damage the Flex 1500. Flex
does not give specific numbers for protecting against damage but I
would not even remotely consider putting anything more than 0dBm into
it and probably not more than -10dBm. So, you need a 30dB pad between
the output of your TX and the input of the 1500.
Also, the 50 ohm input impedance of the 1500 in parallel with the 50
ohm impedance of the dummy load would present a 25 ohm load to the TX
or about a 2:1 SWR.
So, get a proper pad.
--
Brian Lloyd, WB6RQN/J79BPL
3191 Western Dr.
Cameron Park, CA 95682
[email protected] <mailto:[email protected]>
+1.767.617.1365 (Dominica)
+1.916.877.5067 (USA)
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