[MRCA] [MMRCG] New RTTY Video

[Tim]

Hi Ray - yes the PRC-174 is a bit of a head scratcher...It and the '104
were both designed by Hughes and are otherwise near contemporaries.  The
104 sales pitch at the time touted use of Large Scale Integration circuits
(LSI) presumably to save power, volume, improved reliability etc.  The 174
does not use any LSI (except maybe the EPROM) or even ASIC's as far as I
can determine...  I'm wondering if their original intent for the (cheaper?)
174 was for export only as the 104 won the IHFR competition in contracts.
There seemed to be a market for "para military" type HF gear for countries
with limited resources..

I've used PRC-104's in the service but never had to repair one - or send
one back for repairs . (good radios!)..So far, I'm liking the 174, but then
again it ain't broke..!

GRC-106 FSK:  I don't have any experience with one but maybe the idea is
since it is FSK and not AFSK the PA does not need to be biased linearly for
RATT, just biased into Class C and driven harder for FSK?  That might
explain the increased power output.. I dunno

Tim
N6CC

On Tue, Mar 23, 2021 at 12:21 PM Ray Fantini <RAFANTINI at salisbury.edu>
wrote:

> I have a PRC-174 lurking under the work bench, not mine but one that I was
> given to repair. Been using the excuse of not doing anything with it due to
> lack of documentation but your email forced me to remember that I need to
> look at that one and after several searches downloaded the manual for it.
> There is something about that radio, never used one yet but once I resolve
> the issue with this one that was sent to me tend to try playing with it
> first. Somehow makes me think it wants to be a PRC-104 but looks like it
> may be way easier to work on then the 104
>
> As far as field RTTY goes find it hard to beat simple laptop with Windows
> running MITTY, it’s a great use for all those old systems that wont run
> Windows 10. I have used my old Gateway running XP and MTTY and a simple
> interface that I built up with the 106 in FSK mode and the radio works
> great. The GRC-106 is biased different in FSK from SSB and develops more
> power in that mode, don’t know why but it dose.
>
>
>
> Ray F/KA3EKH
>
>
>
> *From:* MMRCG at groups.io <MMRCG at groups.io> *On Behalf Of *Tim Sammons via
> groups.io
> *Sent:* Monday, March 22, 2021 3:08 PM
> *To:* MMRCG at groups.io
> *Cc:* mrca at mailman.qth.net; MRCG at mailman.qth.net;
> milsurplus at mailman.qth.net
> *Subject:* Re: [MMRCG] New RTTY Video
>
>
>
>
>
> Hi Ray - You really pegged the Cool Meter with that setup!  I envy your
> design skills.....
>
> I also took advantage of the BARTG RTTY event this weekend to smoke test
> my PRC-174 FrankenSystem.  Absent any kind of military Terminal, I used a
> laptop running FLDIGI via a Signalink interface.  Improvise, Adapt,
> Overcome....
>
> The PRC-174 is new to me so I am exercising its capabilities.  I worked a
> number of 170 cps shift RTTY stations this weekend and will get it going on
> mil RATT 850 cps shift protocol Clatternet on Saturdays at 2200Z, 7087 kc
> out west here.
>
> This will be fun for remote camping (I do that to get away from
> "technology"  hihi....)
>
> Take a look here down towards the bottom for the RTTY setup:
> http://www.n6cc.com/prc-174-hf-manpack-radio-set/   Sorry, no video!
>
>
>
> 73, Tim
>
> N6CC
>
>
>
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