Smallest Dual-6146 HF Transmitter?

[kd4e]

Dimensions (W*H*D): 20.7 x 13.75 x 16"  Weight: 100 lbs

OUCH!  ;-)

Interesting suggestion ... I would just have to run down
to Harbor Freight and get a transmission hoist!

That is one serious piece of BIG IRON!

> You ask a lot! In order to get 100% modulation at the plate, you need to
> have the same power level as the transmitted signal, namely 100W. That's why
> the DX-100 has such a big modulator, with concomitant big, heavy
> transformers. And with tubes, you need high voltage, which usually means big
> transformers too.
> 
> Here's an idea. Get a DX-100 but get rid of the big heavy case, transformers
> and AM modulator. It will be pretty lightweight with all that out of there.
> Find a 100W mono or stereo amp intended for home stereos. Use its output to
> drive the plate. The DX-100's modulator has an output on the rear panel that
> was intended to drive public address systems, and you could feed the signal
> in there once you removed the internal modulator. You would need to keep the
> modulation xfmr, but it's not nearly as big as the others. Replace the big
> bulky power supply with a modern 250W switching power supply such as an
> Astec LPS-250, which is lightweight and small (but has gawdawful noisy fans
> that you'd want to change). Step it up to the needed 800V with a
> transformer.
> 
> Hey, it could work...
> 
> GL & 73,
> 
> Brian, W0DZ
> 
> -----Original Message-----
> From: Heathkit Owners and Collectors List
> [mailto:HEATH at LISTSERV.TEMPE.GOV]On Behalf Of kd4e
> Sent: Wednesday, August 22, 2007 7:56 PM
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: [HEATH-TEMPE] Smallest Dual-6146 HF Transmitter?
> 
> 
> I am looking for a compact dual-6146 transmitter,
> preferably 160-10M, or something with a dual-6146
> final that I can modify.
> 
> It must either be designed to handle AM plate modulation
> at 100W or have enough room in the final RF section for
> me to modify it.
> 
> It must include a power supply suitable to the application.
> 
> No industrial size hernia-makers need apply, I need this
> to be semi-portable.  (I guess that means an efficient
> design on an aluminum chassis.  It's best if the PS is on
> a separate chassis.)
> 
> Based on what I have learned these past few days it seems
> best that I abandon my quest to plate modulate my Heathkit
> HW-100.  Sigh.
> 
> I will bring my HW-100, & the HP-23b PS/SB-600 Speaker, and
> SB-610 scope (the scope is not functioning, may be the crt)
> to TARCfest in Tampa this Saturday - to sell or to swap for
> what I need.
> 
> Sure appreciate all of the wise counsel - I learned a lot!
> 
> 
> --
> 
> Thanks! & 73, doc, KD4E
> Personal: http://bibleseven.com/kd4e.html
> 
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> 


-- 

Thanks! & 73, doc, KD4E
Personal: http://bibleseven.com/kd4e.html

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html