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question rf detect?
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militaryoperator
With my Kuhne 6Cm pa not working I am going to use a 5W (3.5W in real terms) pa but this has no monitor o/p like the Kuhne.
I have a small 7.5-16Ghz Narda directional coupler so the thought was to fit a diode and cap to the f/w output feed to rectify the rf and give a dc voltage so I can monitor o/p in the shack with the unit mast mounted.
Question, what diode to use? I doubt I have such in my junk box, OA91 maybe, even 1N914's but just need a suitable number to look for on ebay.
thanks, Ben.
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Hello Ben,
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The instructions for the Kuhne 5.7ghz G2 transverter state that a BAT15-03W Schotty diode is used for the monitoring of the RF output power. I can send you a picture of the simple circuit if you want. 73 Dave G4GLT. On 6 Dec 2022, at 10:44, militaryoperator via groups.io <Military1944@...> wrote:
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militaryoperator
Hello Ben,
The instructions for the Kuhne 5.7ghz G2 transverter state that a BAT15-03W Schotty diode is used for the monitoring of the RF output power. I can send you a picture of the simple circuit if you want.
73
Dave G4GLT.
Thanks Dave, BAT 15-03W, just what I needed. Circuit wise I have other Kuhne's and can see how its done, small pick up line on the pcb next to the o/p line. I did think about putting a small wire line just above the o/p line on this other amp but I'd probably screw the amp up, so an external sniff might be safer.
cheers, Ben. G4BXD
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militaryoperator
pa o/p layout
 so thought was to add wire coupling link, diode and cap and wire to feed through?
or not?
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John Lemay
Ben
If you use the outboard Narda coupler, it has one potential advantage over a “sniffer” in the amplifier box: You can (just for a test) reverse the connections on the coupler and observe reflected power, to see how the feed is matched (or not).
On the other hand, ignorance is bliss ………………
John G4ZTR
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of militaryoperator via groups.io
pa o/p layout
so thought was to add wire coupling link, diode and cap and wire to feed through? or not? |
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militaryoperator
Ben
If you use the outboard Narda coupler, it has one potential advantage over a “sniffer” in the amplifier box: You can (just for a test) reverse the connections on the coupler and observe reflected power, to see how the feed is matched (or not).
On the other hand, ignorance is bliss ………………
John G4ZTR
good point John.
cheers.
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