Topband: Diversity-capable transceivers

[Chortek, Robert L]

Hi Roger,

You might have been referring to my comment, which was not intended to say the 7800 has a "poor" receiver.   

However, I had a 7800 for 6 or 7 years (and loved it).  I then purchased a 990, which I had side by side with the 7800 for several months. I can tell you from personal experience, from many hours of A/B testing, that the main receiver in the 990 is significantly superior to that of the 7800 when it comes to handling strong adjacent signals.   That does not mean the 7800 has a "poor" receiver, only that the main rx in the 990 is better - at least based on my experience.   

The scope of the 990 is also much improved over the 7800 because the signals shown on the 990 are "nails" compared to the "blobs" on the 7800 compared to the "needles" on the P3 which is the best. 

This is to be expected and hoped for, as older radios are replaced with newer radios with more advanced technology and improved engineering.  

Nothing beats the ergonomics of the 7800/51 which are the best on the market, IMHO.

None of my comments really answer the question of diversity, which I do not use so my comments are a bit off topic....

73,

Bob/AA6VB
________________________________________
From: Topband <topband-bounces at contesting.com> on behalf of Roger Parsons via Topband <topband at contesting.com>
Sent: Tuesday, December 1, 2015 8:06 AM
To: Topband Mailing List
Subject: Re: Topband: Diversity-capable transceivers

I am using the IC7800 as a diversity receiving system on 160m and it is excellent. Both receivers are identical and are locked to the same Master Oscillator. I have been unable to detect any phase drift either with frequency or time.


I was surprised to read a comment that it has poor receivers as all the reports that I have seen (and my personal experience) have shown it to be superior to just about anything other than the K3S (in some respects) and the IC7850/7851. The Main=Sub command only occurs as the button is pressed, so I have built a litle box which updates via the CI-V bus with any change of frequency (firmware by VE3RX).

I wasted a bit of good contesting time this past weekend listening to European stations having often identical SNRs on two separate and physically separated staggered Beverage systems, but sometimes fading between the two, and always enhancing readability on weak signals.

73 Roger
VE3ZI
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