[ARC5] First Post and Questions

Thu Jul 13 11:31:20 EDT 2017

60 Meters (5 MHz channels)

*Only one signal at a time is permitted on any channel

*Maximum effective radiated output is 100 W PEP
5330.5 USB phone1 <http://www.arrl.org/band-plan#one> and CW/RTTY/data2
<http://www.arrl.org/band-plan#two>
5346.5 USB phone1 <http://www.arrl.org/band-plan#one> and CW/RTTY/data2
<http://www.arrl.org/band-plan#two>
5357.0 USB phone1 <http://www.arrl.org/band-plan#one> and CW/RTTY/data2
<http://www.arrl.org/band-plan#two>
5371.5 USB phone1 <http://www.arrl.org/band-plan#one> and CW/RTTY/data2
<http://www.arrl.org/band-plan#two>
5403.5 USB phone1 <http://www.arrl.org/band-plan#one> and CW/RTTY/data2
<http://www.arrl.org/band-plan#two>

*1. *USB is limited to 2.8 kHz

*2. *CW and digital emissions must be centered 1.5 kHz above the channel
frequencies indicated in the above chart

On Thu, Jul 13, 2017 at 10:20 AM, K5MYJ <macklinbob at gmail.com> wrote:

> Are these really legal on the 60M band?
>
> I thought the 60M band was channelized USB only?
>
> Bob Macklin
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"
>
> ----- Original Message -----
> *From:* Bobby Drummond <alphak4ja at gmail.com>
> *To:* Leslie Smith <vk2bcu at operamail.com>
> *Cc:* ARC-5 Maillist <arc5 at mailman.qth.net>
> *Sent:* Thursday, July 13, 2017 8:11 AM
> *Subject:* Re: [ARC5] First Post and Questions
>
>
> Update on the BC-457A transmitter:
>
> I am in still in the process of getting the transmitter ready for putting
> on the air on the 60 meter band.  I am making progress and am happy with
> how it's going so far.  I do not have the oscillator functioning yet (I am
> delayed building my power supply)
>
> Up to this point these are the modifications that I can see that someone
> has done to the transmitter:
>
>
>      1) replaced the original power connection socket at the rear with an
> octal socket.  Said person marked each pin connection on the socket with
> information as to how the octal socket is now hooked up.  Here is the
> information:
>
>          Octal Socket - Power Connection
>
>
>       Pin #:                           Marking:
>
>         1                                 Ground/Earth
>
>         2                                      "        "
>
>         3                               High Voltage - 450 volts DC
> positive
>
>         4                               B+  300 volts DC
>
>         5                               B+  200 volts DC
>
>         6                               No connection
>
>         7                               Heaters
>
>         8                               No connection
>
>
> One other modification that I see is related to relay K 53 (the relay that
> switches 200 volts DC to the oscillator and magic eye tubes as well as the
> cathodes of the 1625 finals to ground)  Someone has bypassed both sets of
> the points with jumpers across the points so that the circuits involved are
> always in the "On" position electrically (power is always applied to the
> oscillator and the cathodes of the finals are always grounded)
>
> It is easy enough to remove the jumpers from the K 53 relay if I want to
> (and at this point I want to).
>
>
> What I would like to know is the following things:
>
>
>   1) in the original set up of the transmitter, when the operator was
> using CW, what was the code key controlling?  It appears to me that the
> code key was not controlling the antenna relay or the oscillator relay.
> Those, as I understand it, were already in the "On" position via the
> Operate function on the control module.
>
> I thought I remember hearing or reading in the past that the high
> voltage/plate voltage was switched off and on during CW operation.  If so,
> then I would assume that the relay to do that switching was in the controls
> ahead of the transmitter.  I remember that the unit was powered by a
> dynamotor and it supplied the power to the transmitter (probably with the
> exception of the 24-28 volts DC for the transmitter's filaments and
> oscillator and antenna relays solenoids)
>
>
>   2) was the screen voltage on the 1625 tubes also switched at the same
> time as the plate voltage for the same tubes?
>
>
>   3) was the oscillator running continuously when the transmitter was used
> in the CW mode?
>
>
> Any help related to these questions would be greatly appreciated.
>
> After watching the YouTube videos related to command set transmitter
> restoring and operating, it appears to me that he operated his rig in the
> video by
>
>          1) continuously powering the B+ to the plates and to the screens
> of the 1625s
>
>          2) inserted the code key in series with the ground side of the
> oscillator and cathodes relay and keyed that relay (he bypassed the antenna
> relay)  This would have started and stopped the oscillator and grounded the
> cathodes of the finals indirectly via the finals.  To reduce chirp in the
> transmitter, he recommended "adjusting" the points closure in the
> oscillator relay so that the oscillator's points closed before the
> cathode's points.
>
> Can someone on the list confirm that?
>
> I have read previously that the best way to operate the transmitter in CW
> mode, sans the normal method of using the control unit and dynamotor, is
> controversial.  The method on YouTube that I saw is probably acceptable in
> my case but I thought I would ask and see what the reasons for the
> differences of opinion are.
>
>
>
> 73 de AK4JA
>
>
>
> On Tue, Jul 4, 2017 at 5:33 PM, Leslie Smith <vk2bcu at operamail.com> wrote:
>
>>   Sorry Neil!  My apologies!  For some reason I believe you started the
>> article.  You always seem to have "the good oil".  Also, yesterday I found
>> your first (ever) posting on this list.
>>
>>    73 de Les Smith
>>    vk2bcu at operamail.com
>>
>>
>>
>> On Tue, Jul 4, 2017, at 22:43, AKLDGUY . wrote:
>>
>> Leslie wrote: "Also, Neil wrote (in Wikipedia) that there are 3
>> different versions of these sets - (or four if you count the "K" series)
>> and there are significant (but small) differences between the versions."
>>
>> I did not write the Wikipedia article, but I have contributed to it. What
>> you mention was pretty much done before I even started.
>>
>> 73 de Neil ZL1ANM
>>
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>>
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>
> ------------------------------
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