Hi again, Another factor that causes expense is the linearity of the final stage output amplifiers...these puppies are linear for most modern radios and more linearity = more cost and higher power consumption. I will stop now...
Chuck On Sun, Oct 26, 2014 at 10:47 AM, Chuck Macenski <[email protected]> wrote: > Hi, > > There are many questions (explicit and implicit) in your question. > Focusing on the tx side only (since we are talking about band edge), the > filters you are talking about are electromechanical. Do a wikipedia search > on SAW filters and you will get a sense for what you are dealing with. > There are many other factors involved in meeting band edge requirements and > other filtering that is or can be performed, but, the expense is often in > the electromechanical components. > > Chuck > > On Sun, Oct 26, 2014 at 1:45 AM, That One Guy via Af <[email protected]> wrote: > >> with the changes in the 5ghz rules, it may force innovation in filtering >> technology to bring cost down, assuming the innovators arent stuck in a >> mindset of the only thing that would work is what there is. >> >> How do filters works? >> >> Are there electronically adjustable filters? >> >> Where does the cost come from on filters? It is not new technology, so >> recovery of R&D on a new tech has long since past, what is it that drives >> the cost up? Is it primarily a matter of it being something needed, so its >> more valuable, or is it something in the physical properties of the filters >> that drives up the cost? >> >> Can you filter electronically a transmitter using something along the >> same lines of noise cancelling headphones >> >> -- >> All parts should go together without forcing. You must remember that the >> parts you are reassembling were disassembled by you. Therefore, if you >> can't get them together again, there must be a reason. By all means, do not >> use a hammer. -- IBM maintenance manual, 1925 >> > >
