[ARC5] First Post and Questions
Bill Cromwell
wrcromwell at gmail.com
Thu Jul 13 11:41:13 EDT 2017
Hi Bob,
CW is allowed (and used) on at least some (or one) of the 60 meter
"channels". The 'rules' have changed a time or two since I studied them.
In an SSB receiver set up for USB (as used on 60 meters) the tone was
supposed to be at 1500 cps - the center of the channel. That tells us
where our transmitted CW signal must be. That particular rule may have
changed.
We may receive signals any which way we want. If we expect to hear USB
phone signals we must set our receiver up exactly one way. We may set it
any way want and I have set my receiver to give me a received CW tone of
about 650 cps. I lost interest (really just put 60 meters on a back
burner) and I am not sure which rules have and have not changed. The
rules were made for the non-technical users of the band to have some
chance of actually using it. That is my kind-hearted version of it.
I am hoping somebody else will weigh in with current rules.
73,
Bill KU8H
On 07/13/2017 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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