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   Home   Help Search  
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Author Topic: Which AM Transmitter?  (Read 38240 times)
KX5JT
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Posts: 217




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« Reply #45 on: October 05, 2011, 06:17:59 PM »

I have a DX-60 with "WC3K" Bill's mods and it makes lovely audio.  It is controlled-carrier however and the poster indicated he was looking for plate modulation.  

I would recommend the 100 watt class transmitters i.e. a Johnson Viking I or II or a Heathkit DX-100.  These will put a decent signal out on 75/80 meters and a strong signal on 40 through 10.  As Tom noted, they are technically "plate and screen modulated" since they run tetrodes but there are plenty of them out there (well not so much the Viking I's but there are a lot of Viking II's and DX-100's can still be found too).

I run a Viking II (some mods to the audio, a hammond driver transformer replaces the marginal stock driver, capacitor values have been changed to allow better frequency response) with a National NC-300 receiver.  A classic D-104 (no preamp, heck no PTT on the base or stem either, it's a real vintage D-104) makes the Viking II sing wonderfully.

If you go with a Ranger or Eico you're down into the 40 watt carrier level which will play okay on 40 through 10 and daytime 75/80 but it's not really enough for nighttime 75/80 imho (unless you drive a STOUT linear that can run heavy duty cycle).

John KX5JT
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G3RZP
Member

Posts: 1275




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« Reply #46 on: October 06, 2011, 12:27:16 AM »

I cannot see the point of a series diode for negative peak limiting. I suppose if you shunt it with a nichrome resistor......no, let's not go there!
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KX5JT
Member

Posts: 217




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« Reply #47 on: October 06, 2011, 07:18:50 AM »

Okay, then.. no diode... but still... the 1950 rigs were good rigs.....
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G3RZP
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Posts: 1275




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« Reply #48 on: October 06, 2011, 12:21:47 PM »

Some were. Not all, but a lot of them. At one time over here, we had 6 manufacturers of HF amateur transmitters, excluding Heathkit. All gone now, and I don't know how they all stayed in business then.
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WS4B
Member

Posts: 5




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« Reply #49 on: December 15, 2011, 07:12:25 PM »

Sorry I am late to this thread. Hands down for me is an FT-102. The three 6146 tubes makes for great AM audio. I implemented the same rack for ESSB and just converted it to the 102 for true Hi-Fi AM. I swear people think I am running plate modulation Collins gear. E-mail me for MP3s of me on AM recorded by different ops receiving me on Flex 5000s. You might be surprised. Now I run AM 99% of the time, and there is no going back for me.

Brad WS4B
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K4RVN
Member

Posts: 261




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« Reply #50 on: December 15, 2011, 09:29:38 PM »

I have a Multi Elmac AF67 with the Elmac AC/DC power supply. It has a 6146 modulated with 5881s in the rig I just started to work on. I do not have a schematic. VFO and crystal control option with two crystals.
Any comments on the quality of this rig? It is AM/FM/CW.
« Last Edit: December 16, 2011, 05:23:39 AM by K4RVN » Logged
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