[ARC5] BC659 dummy load

[Richard Knoppow]

    Thank you, Dave.  I looked but couldn't find a manual. It would be 
nice to find a PDF but maybe it doesn't exist.  I will have a look at 
this one.

On 6/17/2016 11:37 AM, Dave Jackson wrote:
> Richard:
>
> Download the TM at the below link and many of your questions will be answered.  It looks like the radio was intended to be used as either a portable or jeep mounted system.  It just used the 157" AN-209C (and internal matching network) when used in a portable configuration and the MS-116, MS-117 and MS-118 along with the AB-15 antenna base when installed in a jeep.
>
>
> http://www.slideshare.net/blancaisabelcig/tm-11615
>
> Dave, WA4OBJ
>
> -----Original Message-----
> From: Richard Knoppow [mailto:1oldlens1 at ix.netcom.com]
> Sent: Friday, June 17, 2016 11:24 AM
> To: J Mcvey; Dave Jackson; arc5 at mailman.qth.net
> Subject: Re: [ARC5] BC659 dummy load
>
>      Since I am not familiar with the equipment this may be obvious to those that are.  What exactly was this transmitter meant to drive?  If an antenna is it meant to drive it directly or through a tuning unit of some sort, if its meant to drive some other equipment, like an amplifier what sort of input impedance does it have?
>      300 ohms is a reasonable impedance for a balanced antenna of the folded dipole type. The drive point impedance can be anything over a rather large range depending on the relative diameter of the elements and their spacing but 300 ohms is pretty common. Vertical antenna impedance depends on the type. The often used quarter wave antenna working against a ground plane is half the impedance of a free-air dipole or about 35 ohms.  If its a half wave center fed wire its impedance will be similar to a horizontal dipole in free space or about
> 73 ohms.  All this can be found in many text books.
>
>
>
>

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL