[AMRadio] need help with tranmitter design


James M. Walker chejmw at acsu.buffalo.edu
Mon Mar 14 07:19:49 EST 2005


Direct Digital Synthesis. Be advised, some of these generate
spurs, depends on the manufacturer.
Jim
WB2FCN

----- Original Message -----
From: "Jim candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio" <amradio at mailman.qth.net>
Sent: Monday, March 14, 2005 12:34 AM
Subject: RE: [AMRadio] need help with tranmitter design


> Ed,
>
>    You got me there!. Here is an example of a DDS VFO that can work with a
> programmed offset:
>
> http://www.pcs-electronics.com/en/products.php?sub=ham_stuff
>
> Enjoy!
> Jim
>
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net]On Behalf Of Edward B Richards
> Sent: Sunday, March 13, 2005 11:48 AM
> To: amradio at mailman.qth.net
> Subject: Re: [AMRadio] need help with tranmitter design
>
>
> Hi Jim;
>
> LMO is Heathkit's name for their packaged VFO. It stands for Linear
> Master Oscillator. It is used in the SB series of transceivers. It
> produces a linear output from 5.0 to 5.5 mc and is heterodyned to the 8
> operating frequency by 8 crystals in a heterodyne oscillator.
>
> I am working on a transmitter only. I have not thought about a receiver
> yet. I may build a converter to use the BC radio in the car.
>
> Now the shoe is on the other foot. I forget what DDS stands for. Doctor
> of Dental Surgery?
>
> 73, Ed Richards K6UUZ
> AMI member #1534
>
>
> On Sun, 13 Mar 2005 11:22:03 -0600 "Jim candela" <jcandela at prodigy.net>
> writes:
> > Ed,
> >
> >     One option would be to use a DDS VFO as your RF source, and
> > drive the
> > rig in 67 ARRL Handbook without modification. What do you intend to
> > use as a
> > receiver? Is this a tranceiver project? Also I cannot recall what
> > LMO stands
> > for? Maybe "Local Modulated Oscillator"?
> >
> > Some Google hits on LMO:
> >
> > Living Modified Organism
> > Louisiana Radio Records
> > Long Mountain Outfitters
> > Little Marsh Overflow
> > Life Maintenance Organization
> >
> > :-)
> >
> > Regards,
> > Jim
> > WD5JKO
> >
> >
> >
> > -----Original Message-----
> > From: amradio-bounces at mailman.qth.net
> > [mailto:amradio-bounces at mailman.qth.net]On Behalf Of Edward B
> > Richards
> > Sent: Friday, March 11, 2005 11:05 AM
> > To: amradio at mailman.qth.net
> > Subject: [AMRadio] need help with tranmitter design
> >
> >
> > I am designing an AM, tube-type transmitter for mobile use. I want
> > to use
> > a minimum of parts to keep the cost, size, weight and power
> > consumption
> > to a minimum. Also, I want to use as many existing parts as
> > possible. I
> > have a Heathkit LMO for the VFO and a parts HW-101 for the tuning
> > caps,
> > coil etc. I found a circuit I like in the 1967 ARRL handbook, page
> > 187
> > using only 4 tubes plus a VR tube. I need to modify the circuit to
> > fit my
> > wants. I am not engineer enough to redesign it. Can someone suggest
> > a
> > circuit to use a 12BE6 as a pentagrid converter using the oscillator
> > section for a crystal oscillator with the LMO for the RF input. The
> > output would be on final frequency. For 75/80 meters the crystal
> > would be
> > 9.00 mc. I would like to follow the mixer with a driver, then a 6146
> > final. It is screen grid modulated. I have all the tubes. Thanks.
> >
> > 73, Ed Richards K6UUZ
> > AMI member #1534
> > ______________________________________________________________
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