[Milsurplus] Alexanderson alternator on Xmas eve

[John Franke]

The RBA is not a regenerative receiver.  It is a straight TRF with a 
separate BFO.  Check the panel, there is no regeneration control and there 
is a BFO on-off switch.

John  WA4WDL

----- Original Message ----- 
From: "Unserviceable but Repairable" <cosmoline at aa4rm.ba-watch.org>
To: <cosmoline at netboobie.org>; <milsurplus at mailman.qth.net>
Sent: Monday, December 10, 2007 10:33 AM
Subject: Re: [Milsurplus] Alexanderson alternator on Xmas eve


> another item
>
> a cheapo 17.2 kc marker.  I did it w. a cmos divide-by-n & the right
> xtal + 4001 osc w. 9V,  Calibration on DZ-2 hopeless & on Lowe it's
> only good to 1kc.
>
> That marker made all the difference
>
> Say on ferrite bundles.  The L-factor (mu), doubles as an area
> multipication factor too.
>
> For mu=100, if the bundle end area is 10 in**2, effective area is
> 1000 in**2.  About same capture area as a 3' loop
>
> But where ya gonna get the ferrite rods?
>
> And.  And fella built a 17kc-in, 28.017 kc-out self-powered job
> to hoist to the heights.  Idea ws to get it outa purported
> noise blanket near ground.  8' whip doubled as 17.2kc voltage-
> probe antanna like on a car AND 10m out fm mini-ckt.s double-
> balanced mixer..
>
> Used our field day IC703 as on-ground rx.  Result?  Same as other
> methods running @ Hunting Island.  Among these was a RYCOM (railway
> comm.) & a loop.  A very late RYCOM with a BFO to demod 'carrier
> telephony' which is SSB.
>
> Be sure to inject a BFO sig somewhere w. a selective voltmeter.  Maybe
> @ 18kc @ antenna input?
>
> Have never tried a RAK/RBA.  Regen.s both hence no BFO need since
> self-supplied,
>
> Nor has a laptop run w. spectran @ SC seashore.  I remain douptful with
> time window short enuf for 18 wpm.  Suspect noise but have never been
> sensible enuf to see if detectable on "regular rx."
>
>   M
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