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@contesting.com [mailto:amps-bounces@contesting.com] On
>Behalf Of Alek Petkovic
>Sent: 07 September 2010 13:37
>To: amps@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
>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|