[GreenKeys] USB-teletype adapter with ASR33 question
Julien Scrofani
julien.scrofani at gmail.com
Wed Jun 8 14:05:47 EDT 2016
Hi all,
Could you please have a look to the photograh I joined and confirm me
that I have understood well : an old PC power supply for the 12v and a 200
ohms resistor linked to the blank wire.
Thank you!
Bests regards,
Julien
Le mercredi 8 juin 2016, Lester Veenstra <m0ycm at veenstras.com> a écrit :
> The question answered was about the transmit loop
>
>
>
> *Lester B Veenstra MØYCM K1YCM W8YCM*
>
> lester at veenstras.com
> <javascript:_e(%7B%7D,'cvml','lester at veenstras.com');>
>
>
>
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> *From:* teletypeparts at comcast.net
> <javascript:_e(%7B%7D,'cvml','teletypeparts at comcast.net');> [mailto:
> teletypeparts at comcast.net
> <javascript:_e(%7B%7D,'cvml','teletypeparts at comcast.net');>]
> *Sent:* Tuesday, June 07, 2016 6:38 PM
> *To:* Lester Veenstra
> *Cc:* epvgk at limpoc.com <javascript:_e(%7B%7D,'cvml','epvgk at limpoc.com');>;
> GREENKEYS BULLETIN BOARD; Scrofani, Julien
> *Subject:* Re: [GreenKeys] USB-teletype adapter with ASR33 question
>
>
>
> The receive side of the 33 wants 20MA unless you change a couple of things
> in the UCC-6 to 60MA.
>
>
>
> Wayne
>
>
>
>
> ------------------------------
>
> *From: *"Lester Veenstra" <m0ycm at veenstras.com
> <javascript:_e(%7B%7D,'cvml','m0ycm at veenstras.com');>>
> *To: *epvgk at limpoc.com <javascript:_e(%7B%7D,'cvml','epvgk at limpoc.com');>
> *Cc: *greenkeys at mailman.qth.net
> <javascript:_e(%7B%7D,'cvml','greenkeys at mailman.qth.net');>, "Julien
> Scrofani" <julien.scrofani at gmail.com
> <javascript:_e(%7B%7D,'cvml','julien.scrofani at gmail.com');>>
> *Sent: *Tuesday, June 7, 2016 5:24:49 PM
> *Subject: *Re: [GreenKeys] USB-teletype adapter with ASR33 question
>
>
>
> Transmit loop is dry contacts so it does not care. The 20/60 ma question is
> a matter internal to the USB adaptor.
>
>
>
> Lester B Veenstra MØYCM K1YCM W8YCM
> lester at veenstras.com
> <javascript:_e(%7B%7D,'cvml','lester at veenstras.com');>
>
>
>
> Physical and US Postal Addresses
> 5 Shrine Club Drive (Physical)
> 452 Stable Ln (RFD USPS Mail)
> Keyser WV 26726
> GPS: 39.336826 N 78.982287 W (Google)
> GPS: 39.33682 N 78.9823741 W (GPSDO)
>
>
>
>
> Telephones:
> Home: +1-304-289-6057
> US cell +1-304-790-9192
> UK cell +44-(0)7849-248-749
> Guam Cell: +1-671-929-8141
> Jamaica: +1-876-456-8898
>
> This e-mail and any documents attached hereto contain confidential or
> privileged information. The information is intended to be for use only by
> the individual or entity to whom they are addressed. If you are not the
> intended recipient or the person responsible for delivering the e-mail to
> the intended recipient, be aware that any disclosure, copying, distribution
> or use of the contents of this e-mail or any documents attached hereto is
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>
>
> -----Original Message-----
> From: epvgk at limpoc.com <javascript:_e(%7B%7D,'cvml','epvgk at limpoc.com');>
> [mailto:epvgk at limpoc.com
> <javascript:_e(%7B%7D,'cvml','epvgk at limpoc.com');>]
> Sent: Tuesday, June 07, 2016 5:01 PM
> To: Lester Veenstra
> Cc: 'Julien Scrofani'; greenkeys at mailman.qth.net
> <javascript:_e(%7B%7D,'cvml','greenkeys at mailman.qth.net');>
> Subject: Re: [GreenKeys] USB-teletype adapter with ASR33 question
>
>
>
> On Tue, Jun 07, 2016 at 04:58:57PM -0400, Lester Veenstra wrote:
> > Put a low voltage power supply and current limiting resistor (No need for
> 130 V in this case) in series with the ASR TX contacts and the USB input.
> Set up the voltage/resister for 60 MA and you should be in business.
> Before
> you start, put an ohm meter across the ASR TX contacts and you should see a
> fairly low resistance. When typing you should see the resistance go up.
>
>
>
> He's using a 33, shouldn't it be 20mA? (the usb adapter won't care, but the
> tty
> might?)
>
>
>
> eric
>
>
>
> >
> >
> >
> > Lester B Veenstra M??YCM K1YCM W8YCM
> >
> > <mailto:lester at veenstras.com
> <javascript:_e(%7B%7D,'cvml','lester at veenstras.com');>>
> lester at veenstras.com
> <javascript:_e(%7B%7D,'cvml','lester at veenstras.com');>
> >
> >
> >
> > Physical and US Postal Addresses
> >
> > 5 Shrine Club Drive (Physical)
> >
> > 452 Stable Ln (RFD USPS Mail)
> >
> > Keyser WV 26726
> >
> > GPS: 39.336826 N 78.982287 W (Google)
> >
> > GPS: 39.33682 N 78.9823741 W (GPSDO)
> >
> >
> >
> >
> >
> > Telephones:
> >
> > Home: +1-304-289-6057
> >
> > US cell +1-304-790-9192
> >
> > UK cell +44-(0)7849-248-749
> >
> > Guam Cell: +1-671-929-8141
> >
> > Jamaica: +1-876-456-8898
> >
> >
> >
> > This e-mail and any documents attached hereto contain confidential or
> > privileged information. The information is intended to be for use only by
> the individual or entity to whom they are addressed. If you are not the
> intended recipient or the person responsible for delivering the e-mail to
> the intended recipient, be aware that any disclosure, copying, distribution
> or use of the contents of this e-mail or any documents attached hereto is
> prohibited.
> >
> >
> >
> > From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net
> <javascript:_e(%7B%7D,'cvml','greenkeys-bounces at mailman.qth.net');>] On
> Behalf Of
> Julien Scrofani
> > Sent: Tuesday, June 07, 2016 4:29 PM
> > To: greenkeys at mailman.qth.net
> <javascript:_e(%7B%7D,'cvml','greenkeys at mailman.qth.net');>
> > Subject: [GreenKeys] USB-teletype adapter with ASR33 question
> >
> >
> >
> > Hi all,
> >
> >
> >
> > I bought Eric's usb adapter to link my asr33 tty to a PC.
> >
> > As is, I can transfer from PC to the tty but I cannot transmit in the
> other way, tty toward PC.
> >
> >
> >
> > I know that current loops are needed.
> >
> > It works for one way without additionnal power supply, so maybe my 33 has
> an internal current loop. My problem is I'm not able to determine if it's
> really the case and I don't how to add one if I need to.
> >
> >
> >
> > I have no electronic knowledge at all, sorry if my question is a dummy
> one
> !
> >
> > Thank you in advance.
> >
> >
> >
> > Bests regards,
> >
> > Julien
> >
>
>
>
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