My Argosy II 525-D is serial 52501892 The front panel has the "Argosy II"
label.
On the RF Mixer Board, U2 is physically a very small black 4-legged round
device with the following label: 87clk32 I cannot determine if the l is
actually a numeral one, the letter L or the letter I)
My schematic specifies U2 as an ND487CI (or CL or C1).
73, Mike N4NT
----- Original Message -----
From: "Kevin Purcell" <kevinpurcell@pobox.com>
To: <wa3fiy@radioadv.com>
Cc: "Kevin Purcell" <kevinpurcell@pobox.com>; "Discussion of Ten-Tec
Equipment" <tentec@contesting.com>
Sent: Wednesday, September 26, 2007 6:04 PM
Subject: [TenTec] Argosy 525/525D mixers and serial numbers revisited
> Thanks for your replies.
>
> I'm writing another reply but I realized that you help fill in more
> of the serial numbers on my list. See my old post
>
> <http://lists.contesting.com/archives//html/TenTec/2007-05/
> msg00036.html>
>
> So the list of mixers versus serial numbers in now includes yours.
>
> 525 00721 1496 VE7BGP
> 525 ????? PN ring KW7CD
> 525 01188 mixer? WA3FIY
> 525D 01611 ND487C1 N7WIM (with Argosy front panel)
> 525D 01810 ND487C1? WA3FIY
> 525D 02497 ND487C1 N7WIM (with Argosy II front panel)
>
> But we're missing the mixer type in your 525. It would (help) confirm
> the theory that the 1496 was dropped after S/N 00823 and that the
> later 525 used a PN diode ring as mentioned in Dretea's article in
> Ham Radio on Argosymods.
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