[GreenKeys] USB-teletype adapter with ASR33 question
Eric
epvgk at limpoc.com
Wed Jun 8 14:38:15 EDT 2016
On 06/08/2016 11:05 am, Julien Scrofani wrote:
> 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
Julien -
The idea is right, but I think you may need more than 12 volts.The
current flowing in that circuit will need to be at least around 17mA in
order to get good data reception. 24 volts or more might work better.
For very low voltages, the 200 ohm resistor may be unnecessary as there
is already a 1500 ohm resistor in the circuit.
eric
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
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FROM: teletypeparts at comcast.net [mailto:teletypeparts at comcast.net]
SENT: Tuesday, June 07, 2016 6:38 PM
TO: Lester Veenstra
CC: 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>
TO: epvgk at limpoc.com
CC: greenkeys at mailman.qth.net, "Julien Scrofani"
<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
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
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-----Original Message-----
From: epvgk at limpoc.com [mailto:epvgk at limpoc.com]
Sent: Tuesday, June 07, 2016 5:01 PM
To: Lester Veenstra
Cc: 'Julien Scrofani'; 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> 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] On Behalf
Of
Julien Scrofani
> Sent: Tuesday, June 07, 2016 4:29 PM
> To: 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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