[Hammarlund] antenna terminal to coax

[manualman at juno.com]

Hammarlund HQ-145A manual:
See Page 3, Figure 4.

NO coaxial antenna connector is installed on HQ-145A manufactured
receivers.
Antenna strip has 3 terminals: A A G
If you use a coax transmission line to connect to the antenna terminal
strip, the center conductor of the coax connects to the far left "A"
terminal/ A jumper connection should be made to the middle"A" terminal
and the "G" terminal. The shield of the coax is connected to these A/G
terminals. 
If you review the schematic at the antenna input side of the receiver, it
should be fairly obvious why it's connected this way.

If you use a parallel transmission line, each leg of the transmission
line is connected to each "A" terminal. There should be NO connection
between the middle "A" terminal and the "G" terminal. A ground wire
should be connected to the "G' terminal.

NOTE: This assumes that previous owner(s) didn't screw around with these
terminal connections and modified there use. Since you indicated you have
a coaxial connector on this receiver (which it shouldn't have) you need
to verify the A A G terminal connections to the circuitry.

Pete, wa2cwa
www.manualman.com


On Fri, 15 Dec 2023 08:28:09 -0600 Fernan Bolando via Hammarlund
<hammarlund at mailman.qth.net> writes:
> hi all
> 
> it is nice to see this list waking up again.
> 
> I finally found time to get my HQ 145A working again. How do you 
> guys
> connect coaxial to your Hammarlund? I built a twin lead to bnc 
> matching
> network which works ok. The problem is, It seems like any coax I 
> connect to
> it becomes part of the antenna and picks up hiss before I even 
> connect the
> outdoor feedline. My HQ 145a also has  PL259, I am not sure if it is 
> a mod
> that the original owner installed, but it seems to be not as 
> effective as
> the external matching network.
> 
> regards
> fernan VE4FEB