CMU200. Can you fit a spare RF generator from a dead CMU200? - Page 1
Forum section: electronics / testgear

author: DAIRVINE
author_rank: Contributor
timestamp: August 23, 2016, 07:13:15 pm
content: It looks like you can fit a spare RF generator from a dead CMU200. Is this possible? Does the software work. Where do the cables go?Thank you for any input on this.

author: Brainbox
author_rank: Contributor
timestamp: September 07, 2016, 05:47:40 am
content: I try to imagine what You mean by this, but it is absolutely unclear to me.

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 07, 2016, 06:54:17 am
content: In need to own one, but having used one just maybe twice I've still learned the following:The frontends differ, ie you will lose 50W input if you install the 2nd rf gen.

author: eb4eqa
author_rank: Regular Contributor
timestamp: September 07, 2016, 10:48:37 am
content: Not sure why you'd want to trade 50W handling capability for the second generator. I'd actually would like to remove it and regain the 50W option.Roberto EB4EQA

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 07, 2016, 12:01:31 pm
content: If one looks at the datasheet, the RF1 (50W) is ca. 14dB less sensitive than RF2 (2W).One might assume, that there's just an 14dB 50W attenuator inside - why couldn't it be on the outside.Furthermore, more recent firmwares allow preprogrammed attenuation/amplification levels. Why not take this route?This way you'll end up with two generators (albeit the other with -14dB) AND 50W input. Of course this means an external attenuator to be fitted "somewhere" pleasant.

author: richnormand
author_rank: Unknown
timestamp: September 08, 2016, 03:12:00 am
content: Do you need a second RxTx module to feed it?

author: Brainbox
author_rank: Contributor
timestamp: September 08, 2016, 01:32:26 pm
content: So, what I understand now:You have a dead CMU200 with a working second generator (option CMU-B95), right?That option have to be mounted at asuitableFront-End, so, do You have both the right Front-End AND the B95 option?When this is the case, so why are You asking about the cables ?, They are fitted with the corresponding units and can be transferred to the other machine.Software should not be any problem after running the hardware detection and software update.But why should You want to install this B95 option? i found it of less use.It has a very limited power output and limited frequency span.And, as said by others, You will lose the 50 Watt input option.QuoteTo feed what ?

author: oh2ftu
author_rank: Regular Contributor
timestamp: September 08, 2016, 02:05:04 pm
content: Quote from: richnormand on September 08, 2016, 03:12:00 amYes you will need it and quite a bit of ancillaries from the "dead" one.There are three different options for the 2nd rf-gen, B95, B96 and B99. The last being the one which is of most use, really. It makes RF1 identical to RF2 (output).

author: Brainbox
author_rank: Contributor
timestamp: September 08, 2016, 04:23:20 pm
content: There is no need for a second RxTx module when using the B95 option.Far as I know the second RxTx module is only used at the CRTU-RU which have two fully operational Rx and Tx channels.In that case You also need a dual equipped digital board to handle the two RxTx modules.