I ran a significant amount of RTTY with a DX60 in the early seventies using
a homebrew VFO (built from the ARRL"Understanding Amateur Radio" classic; a
printing of the 1960's).
I am by no means a technical savant however I was successful running the rig
with only slightly reduced drive so output was about maybe 10 watts below
what I would drive it for CW. I always tuned it to resonance (as other
gentlemen here have suggested).
I always kept a muffin fan blowing on top the final cage to keep the 6146
cool when I was transmitting. I had the fan switched in the same circuit
with the T/R switch (I thought I was pretty clever in those days for that
one). I would recommend a similar configuration today.
I had that rig for years and I never remember the final going soft so I
believe this would be a good strategy today.
By the way, I enjoy all the comments on this reflector.
A very Happy Thanksgiving and --... ...-- to all.
John, WAØSTX/4
----- Original Message -----
From: "AirRadio" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, November 23, 2008 3:55 PM
Subject: Re: [AMRadio] Low Power AM?
I would think most AM transmitters would not mind running RTTY, after all
most of the ww2 military tx's ran RTTY most of the time anyway, esp in the
RAF here, like the Marconi T1509, 350w mainly RTTY. 2x 813 modulating 2x
813 in the PA.
Running the 6146 off resonance or underloaded will damage them faster than
if the plates were run a bit hot, the best way is try it and see, watch the
plate colour and if they are too red then back off the input a little not
the other way round.
73 Max M0GHQ
----- Original Message -----
From: "rbethman" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, November 23, 2008 8:48 PM
Subject: Re: [AMRadio] Low Power AM?
Bob,
While the plate transformer may well handle that, you are tuning off
resonance of the PI network. That results in tuning off the Plate dip. I
would NOT imagine that this concept would do the 6146s any good at all.
I would suspect that a reduction of Drive would be wiser.
Bob - NoDGN
Bob Macklin wrote:
Can't you just run at reduced input by reducing the loading? Then run the
tube(s) at the CCS rating. The power transformer should take that.
Bob
K5MYJ
----- Original Message -----
From: "rbethman" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>
Sent: Sunday, November 23, 2008 12:14 PM
Subject: Re: [AMRadio] Low Power AM?
George,
Good question! There is NO mention of RTTY operation ANYWHERE in the
Apache Manual.
I'm also not sure how you can safely reduce the power out put following
the tuning procedures, WITHOUT doing some damage to some components.
It does just fine on AM and CW. Mixed results on SSB with the SB-10.
Bob - N0DGN
--
Bob - NØDGN
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