[MRCA] Teletype paper

Fri Mar 15 06:49:23 EDT 2019

Tim,
Thanks for the reply about shifts and practices.  Have fun!
RF

On Thu, Mar 14, 2019 at 6:24 PM Tim <timsamm at gmail.com> wrote:

> Hi Rob -  Good question...Part 97.305 (f)(3) authorizes RATT with any
> shifts of less than 1 kc where amateur RATT is authorized. As to whether
> that would annoy anyone else on the band, different story.
> We have been running 80/40 meter 850 cps shift signals on Saturdays for
> the past 3+ years and have had no complaints that I am aware of.  The only
> significant RATT users are on contest weekends (we avoid that bedlam) but
> now also FT8 and some other very narrow bandwidth stuff...  With the
> filters necessary I doubt we would annoy anyone else, especially for
> occasional tests or QSO's...
> I have also monitored the circuit in use with an independent receiver
> running fldigi which can decode 170 cps shift  RATT or nearly anything else
> and have not seen any apparent interference potentials...but something to
> be aware of...
> TNX..
> Tim
> N6CC
>
> On Thu, Mar 14, 2019 at 2:10 PM Rob Flory <farmer.rob.flory at gmail.com>
> wrote:
>
>> What do the regs have to say about TTY shifts?  There are times and
>> frequencies where 850 would be seriously frowned upon socially if not
>> legally for the amount of bandwidth used.
>>
>> RF
>>
>> On Thu, Mar 14, 2019 at 1:25 PM Ray Fantini <RAFANTINI at salisbury.edu>
>> wrote:
>>
>>> That's what happens now, I can get one leg of the "X" or the other but
>>> not both together. Just have to convince others to try old school 850 Hz,
>>> have MITTY on a computer and can do TTY that way just after having to work
>>> on computers all day at work have no desire to play with them on my time
>>> off. Not unless they are at least thirty to forty years old first. The goal
>>> is to get al this stuff up and working in its original configuration.
>>> Also did try to join into "Greenkeys" again and once again the same
>>> results- not a word back.
>>> What's the status of TTY opps in the Bat Cave? What about you're GRC-19?
>>> Got the modem for that? There will have to be a special prize if not just
>>> bragging rights for the oldest operational system when we do the net.
>>> Anyone can do a rice box with a laptop so they would score something
>>> like a 0.5, modern radio with Ham TTY codec and teleprinter would be 1.0,
>>> and any military radio with teleprinter will be 10.0 with a multiplier of 2
>>> for every decade of service. Weighing the scoring table like that a GRC-19
>>> with mechanical teleprinter would score 50 or 60 points!
>>>
>>> Ray F/KA3EKH
>>>
>>> -----Original Message-----
>>> From: mrca-bounces at mailman.qth.net [mailto:mrca-bounces at mailman.qth.net]
>>> On Behalf Of B. Smith
>>> Sent: Thursday, March 14, 2019 12:44 PM
>>> To: Military Radio Collectors Association <mrca at mailman.qth.net>
>>> Subject: Re: [MRCA] Teletype paper
>>>
>>>    And yet another brain fart, take a signal generator and pick a center
>>> frequency and slowly sweep up and down to check the limits of the "X"
>>> display.
>>> Z
>>>
>>> On 3/14/2019 12:09 PM, B. Smith wrote:
>>> > ARRL uses 170 cycle shift at 45 baud (60 WPM). I assume that since you
>>> > are using your MD-522 in a "850" cycle mode you are required to
>>> > straddle tune the signal. My guess is if you are exactly centered on
>>> > the signal with equal space and mark then since the display depends on
>>> > the mark and space filters then  the mark and space frequency is out
>>> > of the pass band and you will not get a decent "X" display. Solution
>>> > is modify the modem or use the audio output for a add on display.
>>> > Perhaps Another solution is just copy mark or space only. You will
>>> > probably have to modify the modem anyway for transmitting 170 cycle
>>> > shift? I would join the Green Keys list and post some questions there.
>>> > Z
>>> > You can do a search for 8.5 inch "roll" paper.
>>> >
>>> >
>>> > On 3/14/2019 9:02 AM, Ray Fantini wrote:
>>> >>
>>> >> Inching closer and closer to having the UGC-74 and MD-522 up and
>>> >> running. Have paired them with a Harris RF-350K in the shack right
>>> >> now and after I get this all working will be looking at building up
>>> >> cables for use with the mutt and the GRC-106.
>>> >>
>>> >> The two new problems is that I have been having a hell of a time
>>> >> trying to copy the ARRL bulletins in that I can pick them up but just
>>> >> can't seem to get the correct tuning display when doing that. This is
>>> >> with using the 850Hz mode. The other issue is I just ran out of paper
>>> >> last night and need a roll of teletype paper and wanted to know if
>>> >> anyone had a roll or two they can spare.
>>> >>
>>> >> Ray F/KA3EKH
>>> >>
>>> >>
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