Rich,
Sounds like you might make it in time for Straight Key Night!
Pat-K4BEH
On Tue, 21 Dec 2004 21:46:51 -0500 "Richard Arland"
<richard.arland@verizon.net> writes:
> Gang:
>
> Steve Wilson, XE1UFO, graciously provided what I thought was
> supposed to be an Argo 505 (his first rig) as a parts rig for me to
> cannabalize to get "The 509 From Hell" back on the air. It arrived
> today. Boy! Was I surprised when I opened Steve's box and found not
> a 505 but a 509 instead! Granted it was in pretty rough cosmetic
> shape, but it was a 509 and that means I can swap some boards out in
> an attempt to get "The 509 >From Hell" to work on 10M.
>
> For those of you who have forgotten (or have tried to forget) the
> last installment, I have managed to swap out all the transistors on
> the OSC board with 2N2222As in metal cans. Garland Jenkins from the
> T-T Lab graciously provided a new 10M coil and a T-1 transformer
> (doubler/tripler) coil along with several of the orange plastic dial
> pointers that were damaged in the original order during shipping.
> Thank you, Garland!
>
> I substituted the coils and got the doubler/tripler to work as it
> should, but the rig still won't take off and oscillate on 10M,
> indicating that the switch wafers are either badly damaged or not
> making proper contact. Thanks to Steve's generousity I now have the
> ability to swap out the entire oscillator PCB from Steve's old rig,
> OR I can remove the switch wafers from Steve's old rig and put them
> into mine. Either way I end up with a way to check out the final
> stumbling block in getting "The 509 From Hell" to work on 10M.
>
> More on this as soon as I can catch my breath and get a chance to
> pop open Steve's old rig and pull the OSC board. God willing, I
> might have a 100% functional 509 by the first of the New Year.
>
> Now....for the real reason I started this posting................
>
> Has anyone out there ever used an International Radio (InRAD) model
> 752 xtal filter in an Argo 509? This xtal filter is made for an IF
> Freq of 9001.5 kHz. It is a 2.1 kHz wide, 8 pole xtal filter on a
> small PCB. There are four (4) pins on the PCB. I have no other
> information or installation instructions. My Argo's IF filter is the
> stock 4 pole, 2.8 kHz 9Meg filter comprised of four (4) individual
> xtals soldered into the SSB Gen board (P/N 80131). On all the
> previous 509s I done the IF filter swap on, they have all had the
> four xtals mounted on a small PCB that sat piggy back on the top of
> the SSB Gen board.
>
> HELP!!!! I need some info as to how to correctly (the operative
> word, here) make the swap and will I need to realign the IF or SSB
> Gen boards once I do the swap?
>
> I am anxiious to do this mod with this particular xtal filter as it
> should really make an improvement in the Argo's receive specs.
> Speaking of which, has anyone ever tried using a wide band noise
> source and a program called Spectragram to map out the stock filter?
> The usual "mod" entailed swpping the 4 pole stock filter with a T-T
> 8 pole 2.4 Khz xtal filter. I would be interested in finding out the
> quantitative difference in doing this mode. Has anyone tried this
> todate?
>
> 73 and thanks for allowing me to utilize all the bandwidth
>
> Merry Christmas
>
> Rich K7SZ
>
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>
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