[ARC5] ARB Modifications

[Geoff]

Add to my own prior list for below the BCB.

1935 first run HRO with all 9 coil sets, goes down to 50KHz.

1972  HRO-500 (last production run) with LF/10 goes to 5 KHz. 1961-62 all SS 
design

1961 Racal RA-17L with RA-137 LF adaptor goes to 10KHz.

HP-3586B Selective level meter  Goes down to 50Hz, great for listening to 
whistlers as well as giving accurate signal level readings.


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: <wrcromwell at gmail.com>; "Tim" <timsamm at gmail.com>
Cc: <Arc5 at mailman.qth.net>
Sent: Friday, November 02, 2012 2:11 PM
Subject: Re: [ARC5] ARB Modifications


> On 2 Nov 2012 at 10:46, Tim wrote:
>
>> I think that anything with a micro processor or LCD display is doomed....
>> Tim N6CC
>
> I agree. I have been an IT Professional for over 30 years, and in my 
> carefully considered and
> experienced opinion, there is absolutely no doubt in my mind that you are 
> correct.
>
> Both Bill and I have and use the RAK. I also have and use an RAL. In fact, 
> I have several of
> each. My second good receiver was an essentially-NIB RAL-7, for which I 
> traded a BC-
> 348/BCB-ARC-5-"Q-5er" combo so I could work 15 meters. This was in 1957 or 
> 1958.
>
> The RAL-7 became my main station receiver for at least the next 12 years.
>
> To my mind, the RAL is the finest HF TRF receiver ever built.
>
> My RAKs exhibit RF selectivity second to none: the "other side" of 
> zero-beat simply isn't
> there.
>
> Other VLF receivers I have here are the RBL (a National-designed receiver 
> that is essentially
> a cheaper version of the RAK with a direct readout dial, but it is far 
> less stable than the RAK),
> an RCA-designed and built RBA (supposedly the last-word in VLF TRF 
> receivers), and an R-
> 389. I used to have three SP-600-VLF-31s, but had to sell all I had, along 
> with the other two
> R-389s I had at that time. I also have one Mackay 128AY.
>
> The RAK would make an excellent "Q-5er"....although it IS a bit big...the 
> RAL would also be
> good.
>
> Even so, the BC-453/R-23/ARC-5s are absolutely superb receivers at MF. and 
> they are a
> LOT smaller.
>
> Ken W7EKB
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