[ARC5] Fw: Model 19 MKll
Henry Mei'l's
meils at get2net.dk
Thu Feb 25 01:39:35 EST 2010
Right Dennis, its mainly PA regulator that interests me.
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: Thursday, February 25, 2010 6:52 AM
Subject: Re: [ARC5] Fw: Model 19 MKll
> 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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>> >> >> >>
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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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>> >> >> >
>> >> >> > This list hosted by: http://www.qsl.net
>> >> >> > Please help support this email list:
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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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>> >>
>> > ______________________________________________________________
>> > 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: 271.1.1/2705 - Release Date: 02/23/10
>> 08:34:00
>>
>> ______________________________________________________________
>> ARC5 mailing list
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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: 271.1.1/2707 - Release Date: 02/24/10
08:34:00
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