It's been blatantly obvious to me, for years, that the GRE PSR series RF design was lacking.
The problem we have nowadays is that while digital modes, have for the most part, eliminated the annoying noises and hiss associated with scanning, it has also masked the (IMHO) poor receiver design in today's scanners.
Yes, it's likely that LSM causes some digital networks to cut out, but it's also true to say that strong in-band signals can also cause digital drop-outs. In-band, can mean anything within +-50Mhz or more at 800Mhz!
Whistler and Uniden both still use RF amplifiers in the front end that are prone to IMD from strong in-band and out of band signals. They do this to reduce cost and to conserve battery power.
The first IF filtering is routed through a ~380Mhz SAW filter that is as wide as a barn door and lets pretty much everything, including adjacent cell and LTE signals through. These strong, unwanted signals are then applied to IF amplifiers and mixers, which again produce additional IMD products.
Scanner manufactures need to start realizing that they need to spend a few more dollars on RF design that handle 'typical' band conditions today. This is 2017 not 1990!!
The bands today are not only congested with signals, but those signals are closer together and much stronger than they were 20 or 30 years ago. All of this adds up to massive potential for IMD generation in any receiver if it is not sufficiently protected by appropriate bandpass and tight IF filtering.
There is no point spending thousands of man hours on software R&D, if the basic RF chain from antenna socket through to the final IF stage, isn't up to par.
In my experience, Whistler's main competitor's RF design is still superior in this respect, but still not as good as it could, or should be.
Anyway, that' my rant..