[TenTec] T-T Argonaut 509 Offset Tuning & IF Filter Mod

[Richard Arland]

Has anyone ever tried increasing the RIT (offset tuning) on an Argo 509? If so, what was your approach to the problem?

I'd l;ike to increase the OT to cover a minimum of +/- 5 kHz on each band so I could have a better chance at working DXpeditions. Actually +/- 7 kHz would be better, come to think of it. Anone done it?

My latest 509 has just undergone a mod to replace the stock 2.4kHz 4-pole filter with an InRad #752 2.1 klHz 8-pole filter and the results are nothing short of spectacular! Using Spectagram software and an Elecraft white noise generator I graphed out the results and the difference in the stock filter compared to the new InRad filter is amazing. 

I am planning on writing all this up in the an upcoming issue of the American QRP Club's newsletter "The Homebrewer".  So, if anyone has a worthwhile solution to the Offset Tuning problem or some other mods that you have done that improve the T-T analog Argonaut series of rigs, please get them to me ASAP. Credit will be given at time of publication. 

73 

Rich K7SZ


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