[1000mp] QST Product Reviews whitewash

Tue, 16 Apr 2002 10:18:14 -0400

> It would be refreshing to see: "the transmit IMD of this product is 
> simply not acceptable for a modern radio.  We would expect to see 
> third order IMD results at least -36 dB and fifth order products  
> at least -46 dB.  Any manufacturer that releases a product which 
> fails to achieve that standard simply does not care about the 
> amateur market!" 

And you are willing to pay how much for this improvement?

73, 
Ed Hare, W1RFI
ARRL Lab
225 Main St
Newington, CT 06111
Tel: 860-594-0318
Internet: [email protected]
Web: http://www.arrl.org/tis

> -----Original Message-----
> From: Joe Subich, K4IK [mailto:[email protected]]
> Sent: Monday, April 15, 2002 3:00 PM
> To: [email protected]
> Subject: RE: [1000mp] QST Product Reviews whitewash
> 
> 
> 
> Ed, 
> 
> It would be refreshing to see: "the transmit IMD of this product is 
> simply not acceptable for a modern radio.  We would expect to see 
> third order IMD results at least -36 dB and fifth order products  
> at least -46 dB.  Any manufacturer that releases a product which 
> fails to achieve that standard simply does not care about the 
> amateur market!" 
> 
> It is time to call them as they are and clearly condemn sloppy 
> designs.  If those who have the ability to accurately measure 
> performance in their reviews would do so, we might see more 
> attention to quality. 
> 
> 73, 
> 
>    ... Joe, K4IK 
>  
> 
> 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]On Behalf Of Hare,Ed, W1RFI
> > Sent: Monday, April 15, 2002 1:10 PM
> > To: '[email protected]'
> > Subject: RE: [1000mp] QST Product Reviews whitewash
> > 
> > 
> > The Review said:
> > 
> > "Unfortunately, one number we'd like to have seen change greately 
> > in the IC-746PRO did not -- two-tone, third-order transmit IMD. 
> > This number indicates whether the unit will generate undesireable 
> > intermodulation products that can lead to splatter. On the worst-
> > case band -- 10 meters in both cases -- third-order products were 
> > down by about 23 dB in the original '746 and about 25 dB in the 
> > 'PRO. In contrast, the IC-756PROIII's worst-case third-order 
> > products were down 30 dB -- not terrific, but getting there. 
> > The third order numbers were about the same on the worst-case 
> > VHF band, 2 meters.
> > 
> > 
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