[AMRadio] Source Broadcast Xmtrs

[John Lyles]

I've been reading this thread for a few days now, and my only comment so 
far is that we hams don't need to be defending ourselves for wanting to 
resurrect old AM BC rigs as long as we are respectful with them, don't 
intend to QRM. Every example of BC transmitters that I have heard up on 
HF ham bands have had very clean operations. This is not always the case 
with HF radios, especially with external power amplifiers.

The Power Pebble Continental 314R1/Collins 828C1 has a single 3-500Z PDM 
switch tube and a pair of them for RF. Only the switch tube driver is 
solid state. I know of at least 3 other hams now who have these and 
several are in converted operation on the top band now. One tricky part 
is the solid state RF driver. My only problem is that I design high 
power RF amplifiers for a living, so I lost spunk for ham radio 
conversions. So they sit in my garage waiting for the day.
73
John
K5PRO


> Message: 6
> Date: Sun, 12 Jun 2011 14:36:53 -0400
> From: W2XJ <w2xj at nyc.rr.com>
> Subject: Re: [AMRadio] Source Broadcast Xmtrs
> To: amradio at mailman.qth.net
> Message-ID: <4DF50745.2060100 at nyc.rr.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Gee I forgot about that TX. 1 Kw with a solid state PDM modulator.
> Beyond AM, it would make an excellent unit for EER with some tweaks to
> the audio chain.
>
> On 6/12/11 2:17 PM, Jim Wilhite wrote:
>> > I don't know about a 315B but John, K5PRO has a 314R1 that he has been
>> > working on for several years.  The last contact I had with John he had
>> > it working on its original design frequency and hit a work point he had
>> > to stop.
>> >
>> > You can read about it here.
>> >
>> > http://www.jtml.info/314R1/314R1.html
>> >
>> > That Continental design does present some challenges.  Maybe he will
>> > join in and share his knowledge about the set.
>> >
>> > Jim/W5JO
>> >