Hi Pete,
Congratulations on the SS-1R! Do you have the panadaptor for it too? A
friend has them both and they're quite an interesting set up. I have an
Interceptor and Interceptor II and I seem to remember that one of them uses
the 7360 as a mixer. However, I think it mixes the output of a crystal
oscillator with the VFO -- like Drake does in the 4 line -- rather than
using the tube as the first conversion mixer. Of course the Interceptor is
basically a 6m receiver with built-in 2m meter convertor, but I'm referring
to the convertor in the main or 6m receiver.
I have an RCA receiving tube manual from 1971 that describes the
application of the 7360 as a balanced modulator or mixer. I think the tube
can work very well, but requires attention to power supply purity and lead
dress to maintain balance in the circuit.
73,
Ed N3CMI
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Sent by: To
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Subject
11/06/2003 01:37 Re: [AMRadio] FW: Homebrew receiver
PM
Please respond to
[EMAIL PROTECTED]
th.net
Clegg Intercepter receiver for 6 and 2 meters also used the 7360 as a
mixer. In my Squires Sanders SS-1R receiver, with no signals present and
the antenna connected, the receiver is very quiet. It comes to life when
you tune a signal. The receiver was not very tolerant of random length
antennas or antennas that didn't provide a decent match to the
frequencies you wanted to receive. The 7360 was also used as a balanced
modulator in a number of 60's sweep tube SSB transceivers.
Pete, wa2cwa
On Thu, 06 Nov 2003 09:42:23 -0500 Brett Gazdzinski
<[EMAIL PROTECTED]> writes:
> Well, I never even seen a Squires Sanders receiver, let alone
> listened
> to one!
>
> I cant recall offhand any other receiver that used a 7360
> as a mixer, but need to look in my vacuum tube receiver book,
> it lists all the receivers with their tube lineups.
>
> The ARRL sure liked the 7360, they used it in a lot of their
> receiver projects, in the 1967 handbook anyway.
>
> I suspect the cost of a 7360 was lower back then, not sure why
> its so expensive now, must be very rare?
>
> On the lower bands, I am not sure getting a really quiet mixer is
> important at all, but have not tried the other designs yet.
>
> I never realized just how noisy some receivers are till the
> first homebrew was done and compared it to the R390A.
> I guess you think its atmospheric noise, or just get used
> to it, but I cant stand the R390a anymore.
>
>
> The first homebrew receiver is VERY quiet, but is an odd
> design, I hope the new one is fairly quiet with the design
> I picked.
> If its not quiet, maybe I will try to duplicate the design of the
> first receiver using a 7 or 9 pin tube in place of the 12SA7.
>
> I am sure there is a tube to replace the 12SA7 in a miniature
> type.
> Maybe I should have planned it that way from the start, go with
> what you know works well, but trying other things is part of
> the fun...
> It will be easy to change the tube type if the first design
> does not work out (6AH6, cathode injected LO).
>
> Brett
> N2DTS
>
>
> >
> > The Squires Sanders SS-1R and SS-IBS both used a pair of
> > 7360s. I never had
> > a 1R, but I never thought the IBS worked noticeably better
> > than any other
> > relatively high end radio with more conventional vacuum tube
> > mixer circuitry like
> > the NC400 or the 51J4. And the thing was harder to align
> > correctly as well
> > (maybe that's why I won't impressed = never got it right:) Scott
> >
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