[R-390] Balanced input on higher bands correction

[Jim Whartenby]

Jordan There are Twinax to coaxial adaptors available so you don't really need to jury-rig the connection.  I believe that you have a choice of Twinax to N, BNC or UHF.  
There is one on eBay, Item # 401412862478 which adapts Twinax to BNC.  Another is Item # 132072997494 which is Twinax to UHF.  If you are patient, the perfect adapter for you application will eventually show up, at a decent price.
Not my auctions, don't know the sellers, etc.  <grin>
Jim

Too much agreement kills a chat.  E. Cleaver

-----Original Message-----
From: Jordan Arndt <Outposter30 at shaw.ca>
To: R-390 Forum <r-390 at mailman.qth.net>
Sent: Thu, Dec 23, 2021 12:38 pm
Subject: [R-390] Balanced input on higher bands correction


Hi group and Happy Holidays...

Sometime back I responded to a post stating that my 390As all had an issue 
above 15-16Mhz when connected to my ~90 foot wire via the balanced antenna 
input...

The problem was not the antenna or the balanced input. The real problem was 
that I was temporarily using an 18" jumper to ground one side of the 
balanced input connector to the chassis.

Once I replaced the 18" jumper with a 2 inch wire grounded to the mounting 
screw just below the balanced input connector, the sensitivity was restored 
from 15 to 32 Mhz. In fact, I'm surprised at how much of a difference the 
length of that connection made...

Live and learn...!

73...Jordan VE6ZT 

______________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:R-390 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html