[Icom] Icom Pro II and PW-1 (Do I have a problem here!)

Thu, 27 Jun 2002 21:35:40 -0600

Hi,
Nitpicking alright, where is the Bird meter located? At the feedpoint
of antenna? I don't think so. There is a loss on the transmission line
(coax usually). Another way to look is, using the field strength meter.
Other than theoretical interest, I don't care much whether I am sending 
90W or 95W to antenna out of 100W produced. 
73,
Tony, VE6CGX

Bill Tarkington wrote:
> 
> George, thanks for the nitpicking cause I have followed you long enough to
> know you know your stuff!  Anyway, let me either demonstrate my ignorance
> some more or make a point.  Understand the business about determining net
> power.  But, in my case, am using a 1500W dummy load rather than an antenna.
> So, am I correct in believing that there is no reflected power, and thus no
> net, just forward power?
> ----- Original Message -----
> From: "George, W5YR" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, June 27, 2002 1:35 PM
> Subject: Re: [Icom] Icom Pro II and PW-1 (Do I have a problem here!)
> 
> | Actually, the terminology is a little slippery here.
> |
> | On the transmission line there is energy being conveyed toward the antenna
> | via a FORWARD traveling wave.
> |
> | Similarly, due to the reflection process, there is energy being conveyed
> | away from the antenna via a REFLECTED traveling wave.
> |
> | The NET POWER being delivered to the antenna and being radiated, less
> | antenna heat losses, is simply the difference between the Forward and
> | Reflected power values.
> |
> | The Bird is reading either the FORWARD power or the REFLECTED power.
> | Subtract those two readings to get the NET POWER delivered to the antenna
> | to be radiated.
> |
> | Don't you just hate these nit pickers!   <:}
> |
> | 73/72/oo, George W5YR - the Yellow Rose of Texas
> | Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> | Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> | QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
> | Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437
> |
> |
> | Duane Budd wrote:
> | >
> | > And don't forget to subtract the reflected power, as
> | > measured by the Bird, for the TRUE forward power.
> | ----
> | Your Moderator: Dick Flanagan W6OLD, [email protected]
> | Icom FAQ: http://www.qsl.net/icom/
> 
> ----
> Your Moderator: Dick Flanagan W6OLD, [email protected]
> Icom FAQ: http://www.qsl.net/icom/