[Boatanchors] HQ-180 bandwidth

[Glen Zook]

In the 75A-2 and 75A-3 Collins widened the i.f. bandwidth by adding 100K resistors across the i.f. transformers.  To "narrow" the bandwidth the manual says to remove the resistors and then retune the i.f. stages.  The result was reducing the bandwidth from 4 kHz to 2.4 kHz.

This might work in the HQ-180 if it is desired to widen the response.  You might have to "play around" with different resistor values to achieve just the bandwidth required.  If the resistors were "tacked" onto the terminals of the i.f. cans then they could be easily removed to change the receiver back to the original configuration.

Glen, K9STH

Website:  http://k9sth.com


--- On Fri, 9/25/09, Joe Roth-WC4R <wc4r at live.com> wrote:

I have a Hammarlund HQ-180C, all stock. Is there a reasonable way to change the 3 KC receive bandwidth to 5 or 6 KC? I don't want a butcher job. Something clean & reversible.