[HBR] Pullen vs diode ring mixers

[Ron Barlow via HBR]

One of the things that I like about the Pullen, based on my limited experience (2 different HF down converters), is that very little LO power was required for optimum conversion gain. Thus, good local oscillator stability was easier to achieve.
 I suspect that a passive DBM would require substantially more LO power, based on what I have read about usage of same at VHF and above. However, I can not offer proof of this.
 The Pullen probably would have less tolorance to overload, but it was adequately crunch proof, at my QTH. I could not say the same for another dual triode mixer, that I previously used in a 30m downconverter.
               73 de Ron  n4gjv
--------------------------------------------
On Sat, 8/16/14, Shoppa, Tim <tshoppa at wmata.com> wrote:

 Subject: Re: [HBR] Pullen vs diode ring mixers
 To: "HBR Receiver List" <hbr at mailman.qth.net>
 Date: Saturday, August 16, 2014, 3:03 PM
 
 The diode ring mixer is
 an example of a "Doubly balanced" mixer.
 
 I think in old ARRL Handbooks
 and especially "SSB handbooks" you can find
 examples of quad diode tubes being put to use as DBM's.
 The transformer winding details should prove useful.
 
 Tim N3QE
 _____________________________________
 From: HBR [hbr-bounces at mailman.qth.net]
 on behalf of Brian Burns [brian at lessonsinlutherie.com]
 Sent: Saturday, August 16, 2014 12:04 PM
 To: hbr at mailman.qth.net
 Subject: [HBR] Pullen vs diode ring mixers
 
 Hello All,
 
 
 
 A fellow over
 on the funwithtubes list mentioned the 6JU8 quad diode as
 a
 candidate for a diode ring mixer, and
 being a confirmed glowbugger, the idea
 "tickled my whiskers". Is there any
 received wisdom in the group on the
 relative
 merits of the Pullen versus the diode ring mixer?
 
 
 
 An ancillary question: I ran across a mention
 of the "double balanced"
 mixer,
 but not much info. That's another interesting idea, as
 it seems to
 afford some useful cancellation
 of unwanted output frequencies.
 
 
 
 Any comments
 or links to more information greatly appreciated
 (:->).
 
 
 
 Cheers,
 
 
 
 Brian
 Burns   Ex: W5BRO, K6UCD
 
 
 
 
 
 
 
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