[ARC5] First Post and Questions
Michael Hanz
aaf-radio-1 at aafradio.org
Thu Jul 13 11:34:07 EDT 2017
The ARRL website says: "Permitted operating modes include upper
sideband voice (USB), CW, RTTY, PSK31 and other digital modes such as
PACTOR III." I think Bobby was proposing to use CW.
73,
Mike KC4TOS
On 7/13/2017 11:20 AM, K5MYJ 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 <mailto:alphak4ja at gmail.com>
> *To:* Leslie Smith <mailto:vk2bcu at operamail.com>
> *Cc:* ARC-5 Maillist <mailto: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
> <mailto: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 <mailto: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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