[TenTec] Argonaut filter question

[Shawn Upton]

You you to both of you, W5FH and DJ0IP.
Radio is a 505.
Looking up the HyGain, I found this manual:Bama Manual Archive


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Bama Manual Archive


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which lists the 2.1kHz filter as 2.1kHz at 1.8 shape factor.  Not sure if 50dB or 60dB, but it should be better than the stock 2.4kHz filter (although the copy of the manual I have indicates 2.5! at 1.7:1 shape factor).  Better.
I'm not sure it would be easy to change this: this is not a plug in filter like used on Omni, Corsair, etc.  It looks like the soldered each crystal to the board, I think.  Someone removed the crystals and flew in the Galaxy filter--it doesn't look too bad, but it's not plug and play, it is soldered down.  For now it looks best to not mess with that, and instead to focus on the BFO crystal, and see what can be done there--I don't see indication it was changed, but it also doesn't say what it is, just is stamped 48002 on the top.
Shawn kb1ckt 

    On Wednesday, August 31, 2022 at 02:38:10 AM EDT, <rick at dj0ip.de> wrote:  
 
 Hi Shawn,

 

That is the 9 MHz SSB filter out of a Galaxy/HyGain R-1530 receiver.

The Argonaut's 4-pole SSB filter was not centered exactly on 9.000 MHz.

I think it is about 9001.5 kHz.

 

The same filter was later used in the Argosey’s.  There was an option to replace it with a 9 MHz filter and many people did that, so I’m sure several people still have the original 4-pole filter in their junk box.  I have one, but shipping from Germany is expensive.    If you query the group and also the Tentec.com group, you might be able to find one and restore it to its original condition.

 

73 - Rick, DJ0IP

(Nr. Frankfurt, Germany)

May the Sunspots be with Us!

 

-----Original Message-----
From: TenTec <tentec-bounces+rick=dj0ip.de at contesting.com> On Behalf Of Shawn Upton via TenTec
Sent: 31 August 2022 04:24
To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Cc: Shawn Upton <kb1ckt at yahoo.com>
Subject: [TenTec] Argonaut filter question

 

So at a hamfest last spring I picked up a TenTec Argonaut.  It said it was broken and so of course I took pity on it.  I finally opened it up tonight and on the SSB board someone took the liberty of replacing the discrete crystal 2.4KHz filter section with a Galaxy 117-21 filter module.  Says (in magic marker) that it's a 9MHz SSB filter.  A google search shows nothing.

Now I bought this rig broken and if this is a repair too far I won't feel too bad, I can do other things with this (it's not in pristine condition) but I'm curious: does anyone know what a Galaxy 117-21 is?  Any good?  or maybe that's why it was sold as a problem child? (someone did a bad mod, bad impedance match and killed the radio while trying to "make it better", who knows what else is wrong inside this radio, I haven't even powered it up yet).

 

Shawn kb1ckt

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