[Boatanchors] Johnson Ranger R35
hwhall at compuserve.com
hwhall at compuserve.com
Sat Feb 22 23:07:28 EST 2014
Yes, that'd be making poor situation worse, wouldn't it? But it looks like the AD5X mods moved that resistor outside of the VFO box.
Wayne
-----Original Message-----
From: WQ9E <WQ9E at btsnetworks.net>
To: hwhall <hwhall at compuserve.com>; boatanchors <boatanchors at mailman.qth.net>
Sent: Sat, Feb 22, 2014 8:02 pm
Subject: Re: [Boatanchors] Johnson Ranger R35
Wayne,
An important point is the current limiting resistor for the VR tube in the VFO
is already a hot running component in the VFO box which should be replaced
anyway during restoration with a higher wattage unit. If the B+ is increased
(and it will be by the loss of bleeder load plus that caused by the SS mod) then
it puts more heat into the VFO box and that will vary more between loaded and
unloaded B+ conditions. If the B+ is significantly higher the VR tube and
dropping resistor will both be operating outside the desired parameters.
Rodger WQ9E
-------- Original Message --------
> From: hwhall at compuserve.com
> Sent: Saturday, February 22, 2014 9:36 PM
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Johnson Ranger R35
>
> Thanks for the comments, all!
>
> I re-read what the Handbooks (plural) had to say earlier this evening. Besides
draining off the filter caps when power is turned off, there were two other
reasons I saw for pulling all that power down a big bleeder.
>
> (1) To ensure that a necessary amount of current was drawn from the supply to
make the filter choke inductance always met the critical inductance, a condition
which keeps a choke-input filter section from acting more like a capacitor-input
filter (which lets the output voltage with light loading to float closer to the
peak rectifier output voltage than a well designed choke-input filter will do).
>
> (2) The above also contributed to reducing the peak current through the
rectifier tube(s) so that more average current could be drawn for a given tube
type without exceeding its max current ratings.
>
> Since the pubished modification solid-stated the rectifiers, the advantage of
(2) isn't an issue anymore. As long as the other stages (VFO, etc.) & components
don't mind the extra max supply output voltage or the (probably larger) swings
between key-up and key-down supply voltage, then the supply regulation of (1)
becomes no issue. If so, then the removal of hefty bleeder loading isn't
obviously an example of a mod that fails to understand the original designer's
wisdom.
>
> It's good to learn something new or relearn something every day. :-)
> ?
>
> Wayne
> WB4OGM
>
>
>
>
> -----Original Message-----
> From: hwhall <hwhall at compuserve.com>
> To: boatanchors <boatanchors at mailman.qth.net>
> Sent: Fri, Feb 21, 2014 9:11 pm
> Subject: Re: [Boatanchors] Johnson Ranger R35
>
> I have a question about removing R35. It's the bleeder resistor on the power
> supply, I see, and I assume that the original designers selected that for a
> particular reason, otherwise they wouldn't be wasting all that energy n heart.
I
> assume that it was intended to provide the minimum load on the power supply
when
> the transmit key was open, improving the voltage regulation. Are there no
> problems with removing that min load and the increased swing in supply output
> voltage?
>
>
> Wayne
> WB4OGM
>
>
>
> -----Original Message-----
> From: Jbrannig <Jbrannig at verizon.net>
> To: Mr Bill Mellema <n3wm at yahoo.com>; Boat Anchors <boatanchors at mailman.qth.net>
> Sent: Fri, Feb 21, 2014 5:20 am
> Subject: Re: [Boatanchors] Johnson Ranger R35
>
>
>
>
> Bill,
> Try this site. I followed Phil's advice on my Ranger restoration and it
> works very well.
>
> http://www.ad5x.com/images/Articles/Ranger%20Mods.pdf
>
> 73,
> Jim
>
> -----Original Message-----
> From: Mr Bill Mellema
> Sent: Thursday, February 20, 2014 3:53 PM
> To: Boat Anchors
> Subject: [Boatanchors] Johnson Ranger R35
>
> I have a nice Ranger and need to replace R35 the large cause of heat. I'm
> looking for a simple solution and would appreciate any inputs.
>
> Thanks In Advance..
>
> Bill N3WM
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