[Amps] Macaw PRM-1

[ZL2AAA]

I have the original circuit diagram if anyone wants it email off 
reflector.Morrie
----- Original Message ----- 
From: "Alek Petkovic" <vk6apk at bigpond.com>
To: "Martin Sole" <hs0zed at csloxinfo.com>; <amps at contesting.com>
Sent: Tuesday, September 07, 2010 8:10 PM
Subject: Re: [Amps] Macaw PRM-1


> You are quite right Martin.
>
> If I get crazy and desperate for something to do, I might be tempted
> to do just that. It would not be too difficult.
>
> Can't do it right away as it is at my beach house qth and I've just
> returned, 4 hours ago, from a 6 day sojourn down there. Gotta wait
> 'til next Wednesday before I'm back there.
>
> 73, Alek
> VK6APK
>
>
> At 02:41 PM 7/09/2010, Martin Sole wrote:
>>Hi Alek,
>>
>>Only 2 devices? I'd think it would be hardly complex so drawing the
>>schematic from the physical unit would not be too difficult, and useful 
>>for
>>reference. Just the job for one of your frozen nights over a hot cocoa!
>>Stick it the files section mate then we can all have a gander.
>>
>>Martin
>>
>>
>>-----Original Message-----
>>From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
>>Behalf Of Alek Petkovic
>>Sent: 07 September 2010 13:37
>>To: amps at contesting.com
>>Subject: [Amps] Macaw PRM-1
>>
>>I have a Macaw PRM-1 peak reading power/swr meter. From looking through 
>>the
>>archives on this list, I see that others have been looking for manuals or
>>schematics for this  meter.
>>
>>It seems that this unit has a commonly occurring fault. Namely, when set 
>>to
>>peak reading mode, the meter moves hard over to the full scale position.
>>Mine had the same symptoms.
>>
>>There are two active devices in the meter. A 2SK117 mosfet and a 741 op 
>>amp.
>>To clear the full scale fault, you simply need to change both devices. I
>>just did it with my unit and I'm very pleased to have the meter working as
>>it should. You don't need the schematic.
>>
>>73, Alek
>>VK6APK
>>
>>PS: I have 9 spare 2SK117's. If anyone else has the same problem, let me
>>know and I'll post one to you.
>>
>>
>>
>>
>>http://www.qrz.com/db/vk6apk
>>http://www.qrz.com/db/vk6ap
>>
>>
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>
>
> http://www.qrz.com/db/vk6apk
> http://www.qrz.com/db/vk6ap
>
>
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