[HBR] Mystery cans

[Mike Feher]

They sure sound like units out of the ARC-5 series. 73 - Mike




Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: "William L. Hopkins" <wlhopkin@naz.edu>
To: <hbr@mailman.qth.net>
Sent: Monday, May 06, 2002 12:11 PM
Subject: [HBR] Mystery cans


> Hello all,
>
> At the Antique Wireless Association (AWA) Spring Meet on Saturday, May 4,
in East
> Bloomfield NY (Rochester), I picked up a couple of IF cans in rather good
> condition.  One has the number in black ink stamped on it "1851" and the
other
> "1852."  They are identical in size.  The cans are 1 3/8 inches square and
3 inches
> high.  Each has two slug tuning capabilities on the top of the can.
Anyone know
> what these are good for?
>
> ciao
> bill hopkins
> AA2YV
>
>
> Sandy and Kees Talen wrote:
>
> > Is there something I'm missing on using IF's in series ?
> >
> > I connect 2 of the subject, retuned to 100Khz, JW Miller,
> > 15-H, IFs directly together and because of overcoupling see
> > a "double hump". This is not necessarily bad because it
> > "flat tops" the passband like a crystal filter. The BW goes
> > up a little from 3.8Khz to 4.2Khz but the -20dB BW drops
> > from 15Khz to 10Khz which is really good.  Using capacitive
> > coupling between the IFs of 5-10pf the waveform is a little
> > distorted and peaked ....and the -20dB BW goes to 8.5Khz.
> > The -6dB BW actually goes up to 4.8Khz.
> >
> > These are a little more difficult to tune up because it's not
> > just peaking (on the capacitively coupled ones) it's also
> > passband shaping. The direct (overcoupled) set is easier
> > to tune up because just peaking will get you there.
> >
> > 73s  Kees K5BCQ
> > ************************************
> > Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> > construction notes...... via http://www.qsl.net/k5bcq/
> >
> > Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
> --
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>    http://www.studienforum-berlin.de
>
>
>
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> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
>
> Retrieve reflector archived data via
http://mailman.qth.net/mailman/listinfo/hbr
>
>