[ARC5] Inspired hack job

[john rose]

Add the SP-600 in it's several versions. I am hoping my memory is serving, and not sieving, at this point yet I vaguely recall reading Halli advertisements that listed 6 versions. Order one LF band and you lost 30-54 mhz. Order 2 and you lose the next highest band and so on until you could get all 6 bands under 500khz. A couple of SP-600 VLF rigs have shown up on the Bay of E and go for some very, very pretty pennies.

Somewhere around here I have an RBL rig that needs work. When it did work, WOW was it great.

I also am fairly certain the Rycom 2174 Selective Voltmeter is still around here. It was the reason I didn't the RBL and now it's on the fritz. At it's narrowest selectivity I could tune it under 1 kHz, yes under one kilohertz. Never had the antenna to hear down there. There is a long list of selective voltmeters that have routinely been used for DX.

----------------------------------------
> From: geoffrey at jeremy.mv.com
> To: releazer at earthlink.net; arc5 at mailman.qth.net
> Date: Wed, 6 Mar 2013 21:15:56 -0500
> Subject: Re: [ARC5] Inspired hack job
>
> It all boils down to what you expect to listen to.
>
> With the slugs set for maximum selectivity it is fairly sharp for CW. At
> minimum selectivity it is fine for NDB's.
>
> At no point is it good for AM if you want to chase LF BCB DX and it is
> marginal for SSB where there is often one of the experimental stations in
> the 475-495 and 505-515 region. Of course you can swamp the IF's with
> resistors to broaden the response but that would be considered a hack by
> them funny talking purists.
>
> For its size nothing can beat it but there are better choices, even military
> surplus such as the SRR-11/FRR-21. But complexity and servicability problems
> increase dramatically.
>
> The Hammarlund BC-779 (SP-200LX) does cover 100-400 KHz in 2 of its bands
> and has continuously variable selectivity plus Hammies great crystal filter.
> Price is about the same as a clean BC-453.
>
> Carl
>
>
>
> ----- Original Message -----
> From: "Robert Eleazer" <releazer at earthlink.net>
> To: <arc5 at mailman.qth.net>
> Sent: Wednesday, March 06, 2013 7:08 PM
> Subject: Re: [ARC5] Inspired hack job
>
>
> > You know it occurs to me that you would have considerable difficulty in
> > finding a receiver that would do a better job over the 190 -550 KHZ range
> > as compared to an ATA, BC-453, R-11A, or others of that series.
> >
> >
> > I very much doubt the ADF sets, either WWII vintage or more modern, would
> > do as well as a BC-453 or its LF brethren. After all, the 453 was
> > designed for com use on the control tower frequencies, not driving an
> > indicator.
> >
> >
> >
> > I have not done a comparison, but I doubt a BC-348 can hold a candle to a
> > BC-453. I built a Tec Tec receiver kit some years ago that covers 100
> > KHZ -30 MHZ; it cost me $200 in kit form and is a nice design, but its
> > performance at the lower frequencies was just terrible.
> >
> >
> >
> > Unless you are talking something like an R-389, I doubt that even today
> > you could do better than a BC-453 for 190 - 550 KHZ, and mostly not as
> > well.
> >
> >
> >
> > Given the gradual Federal abandonment of NDB's the 453 may just be the
> > best thing ever produced for that band and the best thing that ever will
> > be produced in significant quantities.
> >
> >
> > Wayne
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