[AMRadio] need help with tranmitter design


k0ng at inebraska.com k0ng at inebraska.com
Sun Mar 13 16:23:43 EST 2005


Linear Master Oscillator (like Heathkit LMO)

73 DE K0NG

Quoting Jim candela <jcandela at prodigy.net>:

> 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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