[1000mp] Inrad Front-end Mod

[n3drk]

This mod everyone is speaking of is it for the Mark V also and what serial
numbers?
Thank You
john

----- Original Message ----- 
From: "Harry Yingst" <ab2pn@yahoo.com>
To: <1000mp@mailman.qth.net>
Sent: Sunday, January 18, 2004 10:12 PM
Subject: Re: [1000mp] Inrad Front-end Mod


> The service manual has you set the IF gain using only 1 block on the
> s-meter lit with a +11dbu source.
>
> Now not having a calibrated signal source I had go in reverse to find
> the proper point.
>
> How I did mine was to inject a signal from my signal generator then
> adjust the amplitude of the signal generator until I had just 1 block
> on the s meter lit (doesn't take much signal).
>
> Then with the IF mod in place and without changing the signal generator
> settings that were made above I re-adjusted the IF gain to try to get
> to the same point (only 1 block lit)
>
> When I started My 9-1 setting was 13 with the mod in place my final
> setting turned out to be 10.
>
> Without the mod IF (9-1) = 13 and 1 S-Meter block lit
>
> With the mod IF (9-1) = 10 S-Meter = S 1.5
>
> I tried setting the IF (9-1) to 9 but that setting was too light (no
> S-Meter reading at all) and the rig seemed a little deaf.
>
> 10 turned out the best for me.
>
> I had earlier spoke with Inrad (George?) and he said the Mod provides 8
> db of gain.
>
> Good Luck.
>
>
> =====
> -
> Harry - AB2PN
>
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