[Hammarlund] {Collins} more on Collins Filter for Hammarlund

[Al Santangelo]

CQ magazine of that era also had an ad for the Collins mechanical
filter adapters for the SP-600.

I'm wondering where this MFA? Hammarlund part number came from. From a
Hammarlund catalog or somewhere else? Its not from whats printed on
the front of the filter adapter case. Theres only the type number
355B-31 (a 3.1kc bandwidth) and the Collins part number 522 9032 004.

Al VE3AJM

On 9/15/12, Brian Harris <cosmophone at yahoo.com> wrote:
> All,
>
> Rodger WQ9E found a 1955 August Radio and Television News which which
> featured the filter in question.  They were available in .8, 1.2, 3.1 and
> 6.0 Kc and for the SP-600.
>
> Thank you all for your help.
>
> Brian Harris, WA5UEK
> cell 214-763-5977
> email cosmophone at yahoo.com
>
>
> ________________________________
>  From: susy <jonesjames at imonmail.com>
> To: A R <raf_3 at msn.com>; Richard Knoppow <dickburk at ix.netcom.com>; Brian
> Harris <cosmophone at yahoo.com>; Collins Collectors Association
> <COLLINS at LISTSERVE.COM>; Hammarlund <hammarlund at mailman.qth.net>
> Sent: Saturday, September 15, 2012 9:15 AM
> Subject: Re: {Collins} more on Collins Filter for Hammarlund
>
> There were quite a number of "filter adapters"/filter conversion kits with
> 353/354 model numbers.
>
> One was recently sold on ebay that was a 1.2 kHz unit (MFA-2) and was said
> to be for the SP-600.
>
> I have never seen anything on any of the SP-600 sites that mentioned the
> adapters.  There have been some filter conversion articles for some of the
> Hammarlund receivers, but none ever mentioned the adapter.
>
> Nothing mentioned in any of the listings for any of the military units,
> although there were some contracts that were considered to be CIA that may
> have used the adapters, but I suppose we will never know for sure.
>
> The adapters had model numbers such as 353A12, so I assume the last digits
> were the bandwidth indicators.  I found:  05, 08,1, 12, 14, 15, 31 and 60.
> Looks as though once you plugged in the adapter, you were limited to that
> bandwidth until you plugged in a different adapter.  Seems like that might
> not be to good for hams, but would be great if you had a rack with a bunch
> of receivers.
>
> There was an adapter for the HRO-60, but I think it was National not
> Collins.  There was also a Mackay adapter for the SP-600.
>
> More investigation needed on this one!
>
> 73
> Jim w0nkn
>
>
>