[HBR] Mystery cans

[William L. Hopkins]

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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