[ICOM] Dual Receive on Icom 7300

[D C _Mac_ Macdonald]

I'll be darned if I can figure out why Icom does not provide the ability for a separate receive antenna on newer gear as they did on the IC-735!  Verticals work quite well for 160, 80, and 40 meter DX work, but they pick up lots of noise on receive.  Low and long wires work fairly well for reducing receive noise on those bands and amplified magnetic loops are superb for low noise reception there.


DX Engineering does make an external device to hook a separate receive antenna to the regular coax connector but removes that antenna when your rig is put into transmit mode.


The little RCA jumper to enable an easy option for use of a separate receive antenna should be a really simple and cheap addition.


I wonder if anybody has or could come up with a simple mod to add this capability in current transceivers.


* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret'd 61-81 *
** FAA, Ret'd 94-10 *
* * * * * * * * * * *


________________________________
From: icom-bounces at mailman.qth.net <icom-bounces at mailman.qth.net> on behalf of Jonathan Thawley <kc8cpw at gmail.com>
Sent: Friday, November 3, 2017 16:25
To: ICOM Reflector
Subject: Re: [ICOM] Dual Receive on Icom 7300

I have a 751A and I know it has that RCA loop installed.

On Fri, Nov 3, 2017 at 2:15 PM, John Geiger <af5cc2 at gmail.com> wrote:

> Not exactly on the 7300 as it would require a second radio for the second
> receiver, but many of us have these.
>
> I was looking today at the INRAD RX antenna mod for the 7300, and it struck
> me that it should be possible to hook up a second radio to the phono jack
> using a RCA plug splitter.  That way, the antenna input from the second
> receiver and the RG-174 loop into the same phono plug.  Wouldn't that allow
> for normal transceive operation, plus feeding the receiver into that same
> jack.
>
> Here is the MOD
>
> (https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.inrad.net%2Fproduct.php%3Fproductid%3D371%26cat%3D181%26page%3D1&data=02%7C01%7Ck2gkk%40hotmail.com%7C39014cb795a64f29f6b408d5230178e6%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636453411585528421&sdata=yJ2gIFFaQTKtHFsAcTrkPNKIy5vx2TFde5F78peBaAU%3D&reserved=0
)>
> Am I right in my thinking of this, or am I missing something?  It seems
> like many of the older Icom radios like the 735, 740, 745 and 751 had this
> same setup with a coax loop you usually kept plugged into both.
>
> 73 John AF5CC