[GreenKeys] BRPE11

Fri Jan 19 22:59:26 EST 2024

This is just an FYI.
I saw today there is a BRPE11 on ebay. Search "teletype"
73, John W1AN

On 19-Jan-24 11:46, pbirkel at gmail.com wrote:
>
> I removed my punch block this morning and verified that it isn't a 
> contributing cause to my problem with stuck linkages.  It looks fine 
> to me, and now that I can get a closer look I can see that what I 
> thought to be a "wire" is actually a thin blade seen exactly end-on!  
> Wiser am I now as to how my tape guide mechanism is constructed, and 
> operates :->.  I agree with the Teletype engineers that feeding 7/8” 
> tape is not supported by the BRPE21.
>
> I think that one could create a small edge-guide that could be 
> attached on a temporary basis to the front of the Tape Guide Bracket 
> (PN# 142942) to ensure that 7/8” tape is fed correctly as a narrower 
> alternative to 1” tape in order to correctly support 6- and 7-level tape.
>
> *From:* pbirkel at gmail.com
> *Sent:* Thursday, January 18, 2024 6:28 AM
> *To:* Nick England <navy.radio at gmail.com>
> *Cc:* greenkeys at mailman.qth.net
> *Subject:* RE: [GreenKeys] BRPE11
>
> I’ve been guessing about the BRPEB6 based on the photo and ancillary 
> sources.  It’s nice to see official confirmation on that point, and 
> the 6 or 7-level capability.  Thank you for pointing that out :->.  
> The seller saw only 4 magnets on the right, so is it the case that the 
> price list is for a “generic” assembly and there are further 
> variations (perhaps using the 143056 block but with or without the 
> 9^th magnet)?  I’ve asked the seller to take off the punch cover and 
> post photos of the mechanism.
>
> Based on my BRPE21, an 8-level (inline) punch block can indeed 
> do-it-all.  The variations are handled by switching off selected 
> magnets and/or reconfiguring the tape feed/positioning mechanism (the 
> feed-pan snaps into two positions to align the guiding edge of the 
> tape; see Figure 3 in 1154B_BRPE_Parts_Catalog_Dec1970.pdf).  Looking 
> at Figure 4 the operation/use of the “adjustable” mechanism is 
> unclear.  My BRPE21, presumably with the 146261 block, has this 
> mechanism.  My interpretation of the table is that it affects the 
> positioning of the “biasing spring” in order to handle the narrow 
> 5-level 11/16” tape.  However PN 142897 and 146262 look like “plates” 
> to me, not even leaf springs. 1154B_BRPE_Parts_Catalog_Jul1960.pdf, 
> Figure 1-6, is a bit clearer that 142897 is creating a tape 
> contra-edge guide that is located just prior to the tape reaching the 
> punch pins.  As 142897 is slotted, presumably it’s factory-set for 
> 7/8” tape in the BRPE11.
>
> The Figure 4 diagram of the ADJUSTABLE block appears to be incomplete 
> as 146262 never enters the tape path, and it’s shaped differently in 
> my BRPE21 there is instead a very small wire affixed to the back-side 
> of that part that drops into the tape path, or not, depending on 
> position.  There is also a movable shoe over the tape that is not 
> diagrammed; presumably it was a later innovation.  I don’t think that 
> a wire rubbing along the tape contra-edge would be a good idea, so I 
> need to examine this part of the mechanism more carefully, but at 
> least I now have some insights into the purpose of the lever that 
> actuates this part of the mechanism.
>
> WRT driver electronics, I’m working on that starting from Eric Moore / 
> Guy Fedorkow design.  My objectives are 5- thru 8-level support for 
> USB serial, RS-232 serial, and parallel interfaces, plus local 
> self-test/alignment patterns.  I’m using a Mean Well LRS-350-24 SMPS 
> which is adjustable up to 28.8 Vdc augmented by a TVS across the 
> output to make up for any deficiencies in SMPS back-EMF transient 
> protection.  The P6KE33CA looks to me like a good TVS choice:
>
> Polarity: Bidirectional
>
> Working Voltage:           28.20V
>
> Breakdown Voltage:      31.40~34.70V
>
> Clamping Voltage:         45.7V
>
> Peak Pulse Current:       13.3A
>
> From: https://www.mouser.com/datasheet/2/240/media-3320979.pdf
>
> The LRS-350-24 spec claims Overvoltage Protection in the range 28.8 - 
> 33.6V (28.8V is the max. adjustable operating voltage) so presumably 
> transients up to at least 33.6V are OK, and the various components are 
> likely rated (significantly?) higher than that.  The TVS should enter 
> conduction at 31.4V, well before 33.6V, and the final clamping voltage 
> of 45.7V isn't unreasonably high.  The LRS-350-48 in that SMPS series, 
> where I'd expect a lot of component commonality, has a max. adjusted 
> voltage of 52.8V so I'm guessing that the series has the ability to 
> handle at least that much back-voltage.  I've never worked with a TVS 
> (or a SMPS with external output transient protection) before so I'm 
> just going by "book learning" on this one.
>
> WRT back-EMF, the BRPE base includes a top-hat "freewheeling" diode 
> for that purpose wired in parallel with the magnet-resistor (25 ohm, 
> 2W?) serial combination for each magnet; a standard circuit design.  
> Which is a start but I doubt that those diodes are exactly 
> "fast-acting/recovery"; they're unmarked but probably from the (maybe 
> mid) 70's.  While it's possible that a SMPS was in use in that era 
> it's also possible otherwise.  That said, Eric Moore doesn’t seem to 
> have encountered any problems with his use of a SMPS.
>
> Working on the belt-and-suspenders philosophy augmented by “measure 
> twice, cut once” engineering :->.  Slow-n-steady wins the race!
>
> *From:* Nick England <navy.radio at gmail.com>
> *Sent:* Wednesday, January 17, 2024 1:17 PM
> *To:* pbirkel at gmail.com
> *Cc:* greenkeys at mailman.qth.net
> *Subject:* Re: [GreenKeys] BRPE11
>
> Correction -
>
> I said " I thought that the parts book showed that the adjustable 
> punch block would handle 5-8 level?"
>
> That is the 146261 punch block, but I missed 143056 which is 6-8 
> level, 7/8" or 1" tape - I suspect that's what the BRPE11 has.
>
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>
>
> On Wed, Jan 17, 2024 at 1:00 PM Nick England <navy.radio at gmail.com> wrote:
>
>     According to the 1969 catalog, BRPE11 + BRPEB6 is
>
>     6 , 7 , or 8-level, 7/8" or 1" width, In-line feed hole
>
>     633 wpm
>
>     28VDC 1 ampere signal and tape feed out magnets
>
>     See pdf page 10
>
>     https://www.navy-radio.com/manuals/tty/tty-equip-price-1969-01.pdf
>
>     I thought that the parts book showed that the adjustable punch
>     block would handle 5-8 level?
>
>     I really need to get back to my BRPE project - I got a couple of
>     the typesetter 6-level units (with leading feed hole) and
>     convinced some machinist buddies that making a new 5-level in-line
>     punch block would be a "challenge". Now I need to build some
>     driver electronics and figure out how to feed it a character stream.
>
>     https://www.navy-radio.com/tty/brpe.htm
>
>     Nick England K4NYW
>     www.navy-radio.com <http://www.navy-radio.com>
>
>     On Wed, Jan 17, 2024 at 11:25 AM <pbirkel at gmail.com> wrote:
>
>         Of possible interest is a poorly identified (and a bit rough)
>         BRPE11 on eBay: https://www.ebay.com/itm/296166916217
>
>         I suspect from other sources
>         (https://museum.wales/collections/online/object/a7dea37f-0f0a-3cfc-833e-f22b59972974/Paper-tape-puncher/)
>         that’s a BRPE6 base -- hence the electrical support for an
>         8-level punch.  However the CDC 160 used the BRPE11 and that
>         was a 7-level paper I/O system.  So apparently this may be a
>         7-level unit.  The vendor confirmed that there are only 4
>         relays/solenoids on the right.  I think that the mechanics and
>         tape feed ought to work fine as a 6-level unit given the
>         design of my BRPE21 tape feed mechanism.
>
>         I’ve suggested that the seller remove the punch cover and post
>         suitable pictures.  And relabel the listing appropriately!
>
>         Unfortunately this unit falls in the valley between supporting
>         the much more common 5-level and 8-level tapes.
>
>         Interestingly
>         https://collection.sciencemuseumgroup.org.uk/objects/co62588/westrex-8-hole-paper-tape-punch-punch
>         claims that a “Westrex” unit used a BRPE11, yet was “8 hole”. 
>         I suspect that they included the feed hole in the count.
>
>         The "laid back" reel support is interesting (ignoring the fact
>         that the reel isn't properly engaged in the photo).  That
>         design is confirmed by:
>         https://www.computerhistory.org/collections/catalog/102696402
>
>         paul
>
>
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