[Hammarlund] hq180 restoration

Kevin J Ward [email protected]
Thu, 18 Sep 2003 23:27:06 +0000


Chris -

About those extra wires on the gain control  -  -  are you referring to
the RF Gain control?  If yes, those extra wires may be for QSK (full
break-in) operation.  If you are interested in same, check out one of the
older Radio Amateur Handbooks, in the Code Transmission or Keying and
Break-in chapters.  

The system described there applies to radios which have the RF gain
control in the cathode circuits of RF and IF stages.  I don't  know if
the HQ-180 uses that system or not, but it is a very smooth and fast
acting circuit.  I have used it for 45 years in a number of tube type
receivers.  

Kevin  N2IE


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