[ARC5] Fw: Model 19 MKll

Thu Feb 25 00:52:11 EST 2010

Henry,

We have similar philosophies.  I will try to find a scanner, but If not, I
could send you a copy by conventional mail.

The circuits are ordinary except for the closed loop PA regulator, which was
my own unique design.

Dennis  AE6C

On Wed, Feb 24, 2010 at 4:12 AM, Henry Mei'l's <meils at get2net.dk> wrote:

> Could u mail scans of the circuit diagrams of your voltage regulators? -
> especially your HB HV regulator.
>
> I admit that I also modify my vintage surplus as little as possible and
> retain any removed parts so that they can be put back, if desired.
>
> Make it at point to leave outer appearance as pristine as possible.
> Henry
>
> ----- Original Message -----
> From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> To: "Discussion of AN/ARC-5 military radio equipment."
> <arc5 at mailman.qth.net>
> Sent: Wednesday, February 24, 2010 5:13 AM
> Subject: Re: [ARC5] Fw: Model 19 MKll
>
>
> > If your feed-through signal is 50dB down that's doing well.  Spurs and
> > harmonics should also be at least 50dB down.
> >
> > I use all the regulation techniques you mentioned, Henry.
> >
> > The Osc is regulated by two stacked 105V reg tubes. The PA Screen is
> > regulated by stacking a zener on top of the regulator tube stack and then
> > buffering with a single transistor.  The PA Plate uses a homebrew
> > transistor
> > feedback regulator because a triode pass device wouldn't fit on the
> > chassis
> > as a retrofit.
> >
> > Dennis
> >
> > On Tue, Feb 23, 2010 at 3:12 AM, Henry Mei'l's <meils at get2net.dk> wrote:
> >
> >> OK Dennis
> >> You're right about the poor match-capacity path  between osc and PA BUT
> >> I've
> >> been told in several QSOs that my backwave was quite readable
> >> though never told how many S-units or dB down. Do you use VR tubes,
> >> zeners
> >> on all B+ voltages and or a triode regulator for the plates?
> >> I also use a foot switch when I operate with my TCS - when not in QSK
> >> mode.
> >> Thanks for the info.
> >> Henry
> >>
> >> ----- Original Message -----
> >> From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> >> To: "Discussion of AN/ARC-5 military radio equipment."
> >> <arc5 at mailman.qth.net>
> >> Sent: Tuesday, February 23, 2010 10:56 AM
> >> Subject: Re: [ARC5] Fw: Model 19 MKll
> >>
> >>
> >> > Good questions, Henry.  I will try to answer them and also pass along
> >> some
> >> > other details on the setup to satisfy your curiosity.
> >> >
> >> > With a cathode keyed PA the forward transfer of oscillator energy
> >> > through
> >> > the tube inter-electrode capacitance into the output tank (which is a
> >> > bad
> >> > impedance match to this leaking signal) is normally rather low and in
> >> > my
> >> > particular situation measured well within acceptable FCC limits.
> >> >
> >> > As for the adjusting for the difference in frequency between receive
> >> > and
> >> > transmit, I use a spotting switch.  The spotting switch keys the PA
> >> > while
> >> > simultaneously switching the output power from antenna to a dummy
> load.
> >> > As
> >> > long as the antenna is close to 50 ohms (which it is in my case
> because
> >> > I
> >> > use a tuner), the spotting frequency is very close to the actual
> >> > transmit
> >> > frequency.  The actual frequency shift in my setup is closer to 2.5KHz
> >> > when
> >> > fully loaded to 50W plate input (for 30W output) and that is far
> enough
> >> > away
> >> > from the receiver passband to make the backwave inaudible during
> >> > receive
> >> > periods. Full voltage regulation of osc, PA screen and PA plate allows
> >> the
> >> > frequency pulling to take place so quickly this "chirp" is inaudible.
> >> > I
> >> > have also asked a nearby ham to listen closely for the FM sidebands
> the
> >> > pulling creates and these effects are also inaudible.  But what IS
> >> audible
> >> > are key clicks.   The clicks were cleaned up by simply using a little
> >> > shaping on the high voltage keying transistor switch that interfaces
> my
> >> > straight key or paddle to the PA cathode potential.  Finally, I needed
> >> > some
> >> > simple filtering of the power lines and keying line to keep harmonic
> >> > energy
> >> > within the box.  BTW these mods are not intrusive, are reversible, and
> >> > were
> >> > implemented on a rig that had already undergone the standard ham
> >> > conversion
> >> > by a previous owner.
> >> >
> >> > I have used this T-22 with a dipole on a regular basis over several
> >> > years
> >> > for DX'ing and contesting as well as casual operation.  A foot-switch
> >> > actuated T/R relay provides the rapid timing control needed for
> >> contesting
> >> > and chasing DX.  It was a lot of fun on 40M this past weekend during
> >> > the
> >> > ARRL DX Contest.
> >> >
> >> > Dennis AE6C
> >> >
> >> >
> >> > On Tue, Feb 23, 2010 at 1:10 AM, Henry Mei'l's <meils at get2net.dk>
> >> > wrote:
> >> >
> >> >> Dennis
> >> >> Is your transmitting freq 2 kHz off your receiving freq.? -- How do
> >> >> you
> >> >> adjust for the difference when you go from receive to transmit anf
> how
> >> do
> >> >> you know that your not sending a backwavce 2 kHz away from your
> >> >> key-down
> >> >> freq. ?
> >> >> Henry -OZ1UF
> >> >>
> >> >> ----- Original Message -----
> >> >> From: "Dennis Monticelli" <dennis.monticelli at gmail.com>
> >> >> To: "Discussion of AN/ARC-5 military radio equipment."
> >> >> <arc5 at mailman.qth.net>
> >> >> Sent: Tuesday, February 23, 2010 9:16 AM
> >> >> Subject: Re: [ARC5] Fw: Model 19 MKll
> >> >>
> >> >>
> >> >> > With my T-22 the continuously running oscillator (it runs during
> >> >> > receive
> >> >> > periods as well) does not create a backwave issue because the PA
> >> >> > pulls
> >> >> the
> >> >> > osc about 2KHz upon key down.  Regulation of all voltages
> eliminates
> >> >> > chirp.
> >> >> >
> >> >> > Dennis AE6C
> >> >> >
> >> >> > On Mon, Feb 22, 2010 at 11:17 PM, Henry Mei'l's <meils at get2net.dk>
> >> >> wrote:
> >> >> >
> >> >> >> Hi Meyer and everyone else
> >> >> >> I used the method of running the a keying (T/R) relay in series
> >> >> >> with
> >> >> >> the
> >> >> >> 1625 cathodes of my ARC-5 xmtrs back in the 50's. It does gives
> you
> >> >> >> cathode
> >> >> >> bias-but you do lose some power because of the voltage drop,
> >> depending
> >> >> on
> >> >> >> the relay coil resistance- I suppose you could have a pair of
> >> contacts
> >> >> >> that
> >> >> >> short out the relay coil when it kicks in- wonder what that would
> >> >> >> do
> >> >> >> to
> >> >> >> the
> >> >> >> signal (a kind of burp?).
> >> >> >>
> >> >> >> Of course, with the oscillator running, you wont be able to work
> >> >> >> QSK
> >> >> >> and
> >> >> >> you
> >> >> >> probably will have a readable backwave -- I do when keying the
> >> >> >> cathodes
> >> >> >> of
> >> >> >> my TCS final, with oscillator and multiplier stage unkeyed -- same
> >> >> >> with
> >> >> >> the
> >> >> >> ARC-5's  I keyed that way.
> >> >> >> You all are probably  aware of all this-- so call it nostalgia.
> >> >> >>
> >> >> >> 73s, Henry
> >> >> >>
> >> >> >> ----- Original Message -----
> >> >> >> From: "Meyer Gottesman" <wrecktech at yahoo.com>
> >> >> >> To: "Discussion of AN/ARC-5 military radio equipment."
> >> >> >> <arc5 at mailman.qth.net>
> >> >> >> Sent: Tuesday, February 23, 2010 12:52 AM
> >> >> >> Subject: Re: [ARC5] Fw: Model 19 MKll
> >> >> >>
> >> >> >>
> >> >> >> I stripped the usesless UHF out of my WS 19 also. The 80 and 40 CW
> >> >> >> performance is FB. As said before, the only nasty element is the
> CW
> >> >> >> keying
> >> >> >> being at +275 volts. The R/T relay can become the 807 cathode
> >> >> >> resistor.
> >> >> >> If
> >> >> >> the VFO runs all the time when transmitting and ONLY the 807
> >> >> >> cathode
> >> >> >> is
> >> >> >> keyed, there should be little or no chirp and I do not recall the
> >> >> >> drift
> >> >> >> being too bad.
> >> >> >>
> >> >> >> 73,
> >> >> >>
> >> >> >> Meyer Gottesman, W6GIV
> >> >> >> Macon, GA
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> ______________________________________________________________
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> >> >> >>
> >> >> >>
> >> >> >>
> >> >>
> >>
> --------------------------------------------------------------------------------
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> No virus found in this incoming message.
> >> >> >> Checked by AVG - www.avg.com
> >> >> >> Version: 9.0.733 / Virus Database: 271.1.1/2703 - Release Date:
> >> >> >> 02/22/10
> >> >> >> 08:34:00
> >> >> >>
> >> >> >> ______________________________________________________________
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> >> >> > ______________________________________________________________
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> >> >>
> >> >>
> >>
> --------------------------------------------------------------------------------
> >> >>
> >> >>
> >> >>
> >> >> No virus found in this incoming message.
> >> >> Checked by AVG - www.avg.com
> >> >> Version: 9.0.733 / Virus Database: 271.1.1/2703 - Release Date:
> >> >> 02/22/10
> >> >> 08:34:00
> >> >>
> >> >> ______________________________________________________________
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> >> >>
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> >> >>
> >> > ______________________________________________________________
> >> > ARC5 mailing list
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> >> >
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> >>
> >>
> >>
> --------------------------------------------------------------------------------
> >>
> >>
> >>
> >> No virus found in this incoming message.
> >> Checked by AVG - www.avg.com
> >> Version: 9.0.733 / Virus Database: 271.1.1/2704 - Release Date: 02/22/10
> >> 20:34:00
> >>
> >> ______________________________________________________________
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> >>
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> >>
> > ______________________________________________________________
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> >
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>
>
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> --------------------------------------------------------------------------------
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.733 / Virus Database: 271.1.1/2705 - Release Date: 02/23/10
> 08:34:00
>
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