[Lowfer] Equip Advise??????????

Sat, 08 Jun 2002 15:48:28 +0000

GM Bob - tks for the response. On the Palomar, Ihave no idea what
the schematic looks like. As to the conversion freqs, from their
website, there are only the 3.5-4 and 4-4.5 mhz choices. Since I
would be using it with either my JRC NRD-525, R-390A or 51J3
receivers, I was leaning towards the 4-4.5 mhz conversion for the
same reasons you mentioned. I was just looking for input on this
unit or some other mfr's products (pro - con). I'll make a copy
of your info and hold onto it in case I go with the Palomar.
Ironically, years ago (when in USN) I had both a Collins R-389
(which ended up at U of Mont), a SP-600-VLF (forget where it ended
up) and a MacKay VLF superregen from WWII vintage (which I donated
to the SS American Victory restoration project down in Tampa). Now
that have just retired (from merchant marine) wish had kept some
of the gear.
    Agn, tks for the response and I'll still be looking around.
73 Walt (N4GL)


>From: Bob Roehrig <[email protected]>
>Reply-To: [email protected]
>To: Kristjan Ragnarson <[email protected]>
>CC: [email protected]
>Subject: Re: [Lowfer] Equip Advise??????????
>Date: Fri, 7 Jun 2002 20:07:52 -0500 (CDT)
>
>On Sat, 8 Jun 2002, Kristjan Ragnarson wrote:
>
> > Anyway, in regards to the Palomar VLF converter, anyone have
> > praises/damnations? What, if any, advantage of converting to 3.5-4.0 mhz
> > as opposed to 4.0 -4.5 mhz? I am of the opinion that the 4.0-4.5 mhz
> > readout on a receiver would make the mental arithmetic easier.
>
>It's been a while since I have looked at the Palomar schematic (it's
>buried around here somewhere) but doesn't it use the 1496 balanced mixer
>chip?
>
>One thing comes to mind from memory: There is a way to install a pot to
>null out the osc from the output (carrier null if it were used in a SSB
>rig). I recommend doing this to reduce the xtal osc level in the output. I
>don't recall that Palomar did this.
>
>I would use an IF of 2 to 3 MHz as there is little activity there and less
>likelyhood of unwanted signals leaking thru.
>
>
>
>                     73        Bob Roehrig        K9EUI
>                     Aurora University Telecom/IS dept.
>                     630-844-4898   [email protected]
>
>
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