|[AMRadio] AMRadio Digest, Vol 118, Issue 7|
rbethman at comcast.net
Sun Nov 3 11:05:08 EST 2013
It is detailed in the manual on page 43.
R9 MUST be unsoldered on one end.
The rest of the changes depend on whether the BC-939 is used, or not if
a dipole is used.
The BC-939 Antenna Coupler has changes to be made when operating below
A jumper must be placed inside it, and two fixed vacuum caps are also
The jumper in the BC-939 takes one of the roller inductors out of the
This is why I stated the operator's hesitation to just "toss" the BC-610
into use on 160.
The manual specifically states that R9 will be damaged.
Its ratings make it hard to locate a replacement.
This TX is the only one that *I* know of that has to be modified to go
on that band.
Then again, BC-610s aren't for everyone. There are those that never
manage to get one on the air.
They can be a pain. It is satisfying to do so in my experience.
Bob - N0DGN
On 11/3/2013 10:42 AM, Mike Sawyer wrote:
> I am not going to doubt you since you have the manual and I don't. We
> used the same MO and coil. He only went to 1880 with it because he wanted to
> shore up the MO drift and was limited by the temp. compensating caps in his
> junk box. If this is the jumper I think it is, it merely done by moving it
> out of the way. Can you elaborate a little? I have a British embassy rig
> that has the same requirement.
> ----- Original Message -----
> From: "rbethman" <rbethman at comcast.net>
> To: "AM Radio List" <amradio at mailman.qth.net>
> Sent: Sunday, November 03, 2013 10:36 AM
> Subject: Re: [AMRadio] AMRadio Digest, Vol 118, Issue 7
> Consult the manual, specifically the MC-109 modification.
> There is ALSO a component that MUST be jumpered to take it out of the
> The TU for 160, the PA Coil, and the fixed vacuum cap for such must also
> be available.
> Failure to install that jumper WILL destroy a component!
> The same applies when taken back off 160.
> It is thoroughly covered in the manual.
> My particular instance was having to modify the 2.0 to 2.5MC Tuning
> Unit. By doing this mod, I can get down to 1.6MC.
> Bob - N0DGN
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