[Milsurplus] Re: [armyradios] SB-22A/PT Battery Holder question

[J. Forster]

Brooke Clarke wrote:

> Hi John:
>
> I have a photo of the inside back of the SB-22, can you take a 350 KB jpeg?

Yes.

> ...  If this was done and the SB-22 with all line cards was seperated
> and sold seperatly, then I would expect it to still have the clips and
> battery holdersunless they were removed to repair another SB-22.

Mine has no clips and no obvious place to mount them.  I think my unit is NOS.

> I don't have a schematic, but think that there are a couple of terminals
> on the back for external batteries.  I think 3 Volts is needed to power
> the operator's headset and 3 Volts are needed for the night alarm lamp
> on the operator's pack.

Seams reasonable. Was the dry cell pack connected via wires to the terminals or
via the clips? The manual is not clear.

> ... This is just a guess, since I haven't yet found a headset for my SB-22.

Neither have I. I could use 2 of them. Anyone got some for sale?

> The MX-2915 Accessory Kit for the SB-22A contains 2 each TA-222 the standard
> link pack, and one each TA-326 Trunk pack. The SB-22 Accessory Kit, MX-230A,
> contains 3 each TA-222 standard packs.  I think this is the only difference
> between a 22 and 22A.

Robert Downs wrote:

TA-221/PT is the Operator's Unit.  TA-222/PT is the Line Unit.  TA-326/PT is the
Trunk Unit (some places the TM's use "Jack" instead of "Unit").  TA-326/PT was
only supplied in the Accessory Kit for SB-22A.  SB-22 had no Trunk Units
supplied, although from the manuals there seems to be no reason why one couldn't
be used if available.

Robert

The conclusion seems to be that trunk pack(s) are  field installed as required,
which is reasonable.

> I think the TA-326 goes off hook when the plug is pulled out and can be
> used with Common Battery signaling circuits, either a higher level
> switchboard or the Plain Old Telephone System.
>
> See:
> http://www.pacificsites.com/~brooke/SB22.shtml
>
> 73,
>
> Brooke Clarke, N6GCE

Thank you,
-John