[Hammarlund] SP-600 Cabinet

[Richard Knoppow]

----- Original Message ----- 
From: <kirklandb at sympatico.ca>
To: <ka1kaq at gmail.com>; <stanleybadams at yahoo.com>
Cc: <hammarlund at mailman.qth.net>
Sent: Wednesday, December 14, 2011 10:46 AM
Subject: Re: [Hammarlund] SP-600 Cabinet


>
> The cabinets are also pretty weak.  I have had 2 receivers 
> shipped in cabinets and both times
> FedEx/UPS shock treatment cause the spot welds to break 
> loose. Granted the receivers were
> poorly packed, but the nature of the construction of the 
> cabinet is that the radio is held in place
> by a spot weld at the front corners of the cabinet and the 
> cabinet metal is quite thin.
>
> In contrast, a 51J series cabinet is rock solid.
>
    I don't think the cabinets are so much weak as being 
unreasonably stressed by shipping a 65 lb receiver in one. 
The receiver is held by a clamp arrangement where the 
mounting screws on the front go into a threaded bar in back 
of the perforations in the front. Its a bit of a PITA to get 
the screws in. The chassis is also held by two No.10 screws 
at the back corners. One difference between rack mount and 
cabinet mount chassis is the length of the two brackets in 
the back corners: in rack mount chassis the brackets are 
slighly displaced from the bottom chassis surface; uniform 
with the other brackets; on the cabinet mount receivers the 
brackets are longer and are flush with the edge of the 
chassis. One could use long screws on a rack mount chassis 
but probably it would not be very secure in comparison. I 
think chassis and cabinets should be shipped separately. 
Hammarlund sold a kit with brackets to make the change.
     I have found that the spot welding for the brackets 
holding the feet on and for the trim parts around the top 
hatch tend to let loose. Can be rewelded but J-B weld is 
probably much stronger. My cabinet (the only one I've ever 
seen surplus) had one bracket broken off and I made a new 
one. Someone had fixed the other in the dim, distant, past 
by drilling holes and bolting it on.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com