eHam

eHam Forums => Software Defined Radio => Topic started by: VK5DO on June 17, 2012, 10:36:56 PM



Title: Sold my Flex 3000
Post by: VK5DO on June 17, 2012, 10:36:56 PM
Hi All,

I recently sold my Flex 3000 after less than a year of owning it and thought I'd share some observations on the radio.

I live in VK and got the radio sent over direct from Flex in August 2011.  After less than 3 months I had to send it back to the US for repair when the firewire hardware in the radio died.  Tim at Flex was great and they paid for freight both ways from South Australia to Texas and back and I had the radio back in less than a month.

Then early this year I started noticing higher output power on some bands.  This quickly developed to all bands and finally it was outputting 150W on all bands whenever the drive level was set anything above 2% or so.  I figured this might cook something so got in-touch with Flex again.  Dudley was a bit hopeless ("reset the database" multiple times and that's about it) but when I got onto Tim again, things moved quickly towards a solution.  Via Teamviewer he diagnosed the problem remotely and it was sent back to the factory again.  Flex covered the repair and one way of the freight and I had the radio back in about three weeks.  As soon as it got back I sold it.

I'm sure my experience with needing two warranty returns in the 1st year is a bit unusual but with no local support in or near Australia by Flex, I wasn't going to take the chance of this happening a third time.  Maybe mine was a "friday afternoon" build but it certainly seemed like a bit of a dud with 2 serious hardware faults in a very short period.

The other thing that I never did get sorted out despite various combinations, brands, cable runs and dozens of ferrites, was RF getting into the speakers.  I tried four different brands of powered speakers, some quite expensive, all sorts of cabling and ferrite combinations but never did sort it completely.  I could get it to work ok on some or even most bands but I always had one band no matter what combination I used that had massive RF noise.  I could use the same speakers as external speakers on other radios in the shack with the same antennas and they worked fine.  It was only when connected to the Flex that they got RF noise.  I put it down to a shielding issue in the radio??  Who knows. 

I'm not completely off Flex's though.  In fact I'd happily say it's the best radio I've ever had apart from the above issues.  Great to use, excellent receiver and good software.  I'll probably leave it a few years and once again head down the Flex road with a 6000 or whatever they have new at the time.  As long as the audio shielding is sorted out better and QC is improved a bit I wouldn't be afraid to commit again.

Yours,
Dene
VK5DO
VK4TN


Title: RE: Sold my Flex 3000
Post by: KD8DEY on June 17, 2012, 11:52:30 PM
I've only Heard one person on the air locally, admitting to using a Flex 3000 he had just purchased used.
He sounded choppy like he was speaking through a box fan between himself and the microphone.
(And the Box Fan was winning)

I wasn't impressed.....................


Title: RE: Sold my Flex 3000
Post by: ZENKI on June 18, 2012, 03:32:51 AM
Try using a end fed long wire with any Flexradio! Every other radio can handle this with maybe lip bite here and there. All Flexradios and their associated computers just fall into a crumbling heap.

If companies want to place sensitive DAC's and other other sensitive electronics close to a 100 watt PA, the least they can do is include good shielded modules and then RF harden all the hardware and wiring.
The Flexradio inside looks like a PC motherboard its so open in terms of its layout. Its then no surprise that the  Flex3000 cant even handle the RF from a simple endfed long wire at low power. Most laptops handle the RF better than the
Flex3000.

 I also tried to use a Flexradio as a spectrum analyzer on a high power amp. It could not handle the near RF fields surrounding the QRO amp when fed from a directional coupler. The Winradio G31DDC which is nicely shielded in a metal box worked very well in the same situation.  You cant just stuff electronics into  a small box and expect it to handle common and differential mode currents and voltages by itself. The designer has to work very hard to make sure the design is RF hardened.  I think these comments could be made about all the current American made radios. Elecraft, Ten Tec and Flexradio who seem to have this open non shielded  RF architecture layout which is not wise. When you compare radios like Yaesu, Icom and Kenwood they at least try and use as much isolation and shielding as possible Their die cast modular construction results in excellent shielding and RF immunity. My K3 for example has birdies in the receiver,  the level of these birdies  varies  depending  on the position and moving   cables around the inside of the K3. If Elecraft spent some more time designing in some proper shielding you would not  have to move birdies around in a box by moving a cables around.  The K3 in construction terms is really cheap and nasty in this regard. The same is  could be said for the TenTec radios.


Title: RE: Sold my Flex 3000
Post by: K9IUQ on June 18, 2012, 04:29:49 AM

He sounded choppy like he was speaking through a box fan between himself and the microphone.
(And the Box Fan was winning)

I wasn't impressed.....................

This is the well known stuttering RFI in the xmit. $100 worth of ferrites will probably cure it. Do not forget to put a ferrite on your dog's tail..   ;D

RFI in the XMIT is one of those Flex annoyances that the Faithful try to ignore, blaming it always on your antenna, station,computer grounding, etc. They never admit that the problem starts with the Flex Radio.

Stan K9IUQ


Title: RE: Sold my Flex 3000
Post by: NI0Z on June 18, 2012, 04:54:29 AM
Hi All,

I'm not completely off Flex's though.  In fact I'd happily say it's the best radio I've ever had apart from the above issues.  Great to use, excellent receiver and good software.  I'll probably leave it a few years and once again head down the Flex road with a 6000 or whatever they have new at the time.  As long as the audio shielding is sorted out better and QC is improved a bit I wouldn't be afraid to commit again.


My advice is not to ever go back, put the flex radios in your rear view mirror and don't look back!  The reasons you leave something one time more often than not become the reason you'll leave it again.


Title: RE: Sold my Flex 3000
Post by: K9IUQ on June 18, 2012, 05:17:22 AM
My advice is not to ever go back, put the flex radios in your rear view mirror and don't look back!  The reasons you leave something one time more often than not become the reason you'll leave it again.

Maybe. Maybe not. I gave up on Kenwood Radios for 10 years because of some poor experiences with one of their Radios. Time heals, I have a Kenwood in the shack again.  :D

Will I ever have another Flexradio in my shack? I have doubts Flexradio would ever knowingly sell me another radio.  :D :D :D :D

Stan K9IUQ


Title: RE: Sold my Flex 3000
Post by: M6GOM on June 25, 2012, 10:05:53 AM

RFI in the XMIT is one of those Flex annoyances that the Faithful try to ignore, blaming it always on your antenna, station,computer grounding, etc. They never admit that the problem starts with the Flex Radio.

Stan K9IUQ

That is because it IS a problem with your antenna installation and thats the same no matter what radio you use and if you can't recognise that then you're unfit to hold a licence. If you have RFI issued its because common mode is coming into the shack. If you've got common mode in the shack its because you cocked up your antenna installation somewhere along the line.

And no, I don't own a Flex.


Title: RE: Sold my Flex 3000
Post by: K9IUQ on June 25, 2012, 11:36:53 AM
That is because it IS a problem with your antenna installation and thats the same no matter what radio you use and if you can't recognise that then you're unfit to hold a licence.

Baloney. I have held a ham license for 52 years. I am quite fit to hold it and do not need a newbie ham foreigner telling me different. ::)

From your M0GVZ QRZ web page: "I have been licenced since 2009 and am still learning the hobby."  You have a lot more to learn my foreign friend...................

The Flexradio was and is susceptible to RFI in the xmit. The computer and powered speakers attached to the Flexradio aggravate the situation.

I have had the same installation for 12 years. NONE of my radios before the Flex 5K exhibited any RFI in the XMIT. NONE of my radios after the 5K has exhibited any RFI in the XMIT. ONLY the Flexradio 5K had any RFI in the XMIT problems.

Using good old American common sense tells me the problem was the 5K.   :o

Stan K9IUQ


Title: RE: Sold my Flex 3000
Post by: KE5JPP on June 25, 2012, 01:16:03 PM

RFI in the XMIT is one of those Flex annoyances that the Faithful try to ignore, blaming it always on your antenna, station,computer grounding, etc. They never admit that the problem starts with the Flex Radio.

Stan K9IUQ

That is because it IS a problem with your antenna installation and thats the same no matter what radio you use and if you can't recognise that then you're unfit to hold a licence. If you have RFI issued its because common mode is coming into the shack. If you've got common mode in the shack its because you cocked up your antenna installation somewhere along the line.

And no, I don't own a Flex.

Flex Radios are notorious for being extremely sensitive to RFI.  I reported on an experience that I witnessed first hand with another Ham's Flex-5000 almost a year ago:

-----------------------------
A few months ago while using my Flex-5000a I was in a QSO with another Ham who was also using his Flex-5000a.  He was running approximately 800 watts out on 40meters.  While transmitting he opened the transmit equalizer dialog box.  He had been just a few minutes earlier extolling the virtues of the Flex-5000a and PowerSDR in general to a crowd of guys listening.  He wanted to demonstrate how nice it was to have a built-in transmit equalizer. In mid sentence either his PowerSDR or Windows locked up and all I heard was a stuttering "uhuhuhuh puh puh puh uh uh uhuhuhuhuh uh uh  puh puh uh uh ..." for like 30 seconds.  I seriously thought the poor guy was having a stroke or seizure!  No kidding.  On my spectrum display I could see that he suddenly was splattering at least 20 kHz up and down the band causing interference to all those around us with his 800 watts of "uhuhuhuh puh puh puh uh uh uhuhuhuhuh uh uh  puh puh uh uh ...".  After about 5 minutes, he came back on the air to explain what had happened.  He finally had to resort to pulling the power to stop the stuttering loop that the computer had gone into.  

It was the most pitiful thing that I have ever heard live on the air.  I can still hear and still laugh about the half a minute of wide band, 800 watt "uhuhuhuh puh puh puh uh uh uhuhuhuhuh uh uh  puh puh uh uh ..." noises today.  I felt bad for him as he said it was one of the most embarrassing moments in his 40+ years of Hamming.
-----------------------------

I have never had anything like that happen with a conventional rig.

Gene

P.S. Before the Flex Radio Faithful jump on me for posting this experience again, let me remind them that eHam reposts old interesting article submissions for time to time.  What's good for the goose...


Title: RE: Sold my Flex 3000
Post by: K9IUQ on June 25, 2012, 01:58:19 PM
Flex Radios are notorious for being extremely sensitive to RFI.  

All one has to do is Google "Flexradio RFI" You better have lots of time, there is plenty of complaints.

FWIW I bought bought $100 worth of ferrites from Dx Engineering to cure the RFI in the 5K. I called it the Flex-Pak.  ;D

After I sold the Flexradio I took all the ferrites off. I still got them stored in a bag. Someday I may get another SDR...  ;D

Stan K9IUQ


Title: RE: Sold my Flex 3000
Post by: KT4WO on June 27, 2012, 06:12:53 PM
Its like the FT-2000, after years of "the best radio ever made"  years
later " Well...maybe it was not..." or "never really liked it"  .....hahaha

KT4WO


Title: RE: Sold my Flex 3000
Post by: KC4MOP on July 12, 2012, 04:31:57 AM
To completely isolate my Flex radio from the computer, I bought extremely well made audio isolation transformers. The metal case of the computer is not common to the case of the outboard sound card (FA66 in my situation) and the metal case of the Flex Radio. Nice clean TX and RX.
The situation reported on earlier with the stuttering audio seemed like it was always there and when he tweeked the audio EQ, sent the computer into a tizzy. Probably from using unbalanced audio in his shack. Doesn't sound like a Flex radio problem.

These RFI Flex radio problems are from the presence of legal limit RF?? Or just when the operator is talking (SSB)?
You can use the FM mode to create a steady carrier, or AM with the TX audio turned down.

The Flex radio and probably other SDR platforms are capable of very high quality TX audio, and if your audio system is not up to the task of legal limit RF, and you have RFI issues, don't blame the radio. You gotta look back at a broadcast AM station. How do they run their audio? There are many B'cast stations where the studio is co-located at the transmitter site.
Just my .01 cents worth.

Fred...........sorry to ruffle feathers.......I am not a real Flex Faithful type. It's a box made by humans and certainly not perfect.


Title: RE: Sold my Flex 3000
Post by: K9IUQ on July 12, 2012, 08:48:41 AM
The situation reported on earlier with the stuttering audio seemed like it was always there and when he tweeked the audio EQ, sent the computer into a tizzy. Probably from using unbalanced audio in his shack. Doesn't sound like a Flex radio problem.

Your response reads like it is right out of the Flexradio help file. Have you not read this thread? Perhaps like all Flexers you are blind to Flexradio truths and have me and Gene on "ignore".  ;D ;D

Stan K9IUQ



Title: RE: Sold my Flex 3000
Post by: KC4MOP on July 12, 2012, 04:41:35 PM
I thought this forum was a little less problematic than other places. I guess I'll have to put you and Gene on Ignore.
Stuttering audio doesn't come from the radio. It is the computer.
I am not a 'true-blue Flexer". I own an old Flex 1000 and enjoy all modes.
I read that there is an RFI problem in a Ham operator's shack and it shuts down a radio.
The same thing happens in a mobile radio. Top of the line Ham gear, Kenwood, Yaesu and others. They will do the same thing if there is RF in the wrong places.


Title: RE: Sold my Flex 3000
Post by: RFDOG on July 13, 2012, 05:30:54 PM
Stan and Gene have nothing better to do but gripe on the SDR forum and fan flames. Never had a stitch of trouble with my 3000. Kind of fun to read them sometimes, I must admit.  Many of todays hams are just too turn-key and lazy to deal with today's complex radios  Flex or otherwise. Painful truth.


Title: RE: Sold my Flex 3000
Post by: K6LO on July 13, 2012, 05:50:13 PM
Stan Wrote:

..Baloney. I have held a ham license for 52 years. I am quite fit to hold it and do not need a newbie ham foreigner telling me different....

Really?  Wow.  On behalf of U.S. amateurs.  I apologize. 







Title: RE: Sold my Flex 3000
Post by: KE5JPP on July 14, 2012, 04:36:41 AM
Stan and Gene have nothing better to do but gripe on the SDR forum and fan flames. Never had a stitch of trouble with my 3000. Kind of fun to read them sometimes, I must admit.  Many of todays hams are just too turn-key and lazy to deal with today's complex radios  Flex or otherwise. Painful truth.

And what are you doing?   Obviously you have nothing better to do than fan flames in this thread.  At least we don't hide like a little sniveling coward behind stupid anonymous names like "RFDOG" and chuck rocks at people with legitimate gripes.  Painful truth.

For your education (which I am sure will be lost on you) Flex radios are not complex radios.  They just have many problems related to them being tethered to a PC and related to the lack of care that the manufacturer had given to RFI and other issues.  I could forgive this if they were less expensive.  But when they cost as much or more as other radios on the market that perform as well or better, I can't excuse the basic problems that exist with them.

Gene


Title: RE: Sold my Flex 3000
Post by: KC4MOP on July 15, 2012, 04:06:09 AM
Stan and Gene have nothing better to do but gripe on the SDR forum and fan flames. Never had a stitch of trouble with my 3000. Kind of fun to read them sometimes, I must admit.  Many of todays hams are just too turn-key and lazy to deal with today's complex radios  Flex or otherwise. Painful truth.
Thanks for the sanity check.
I was on another forum that Flex owners are Smugg. It is really a pretty neat concept.
I did read a Flex forum about the 3000 and it seems that there were the same issues as mentioned here. And it seems that most people are forgetting that when a computer gets involved then you have a new set of problems.
A lot of Hams aren't really up to speed with a modern computer and try to use a slow processor.
And RFI in the shack will shut down analog radios as it will to an SDR.

Fred



Title: RE: Sold my Flex 3000
Post by: W4VR on July 22, 2012, 02:08:48 PM
It's a work in progress, just like any other radio on the market these days!  Same thing applies to automobiles and computers.


Title: RE: Sold my Flex 3000
Post by: K6LLO on May 24, 2013, 07:13:23 AM
I have had flex 3000 for over two years.  The only problems I have had have been computer related- stuttering audio, lock-ups, etc.  Isolating the computer, using plenty of ferrite, having enough CPU and memory has stopped all problems. When CPU usage on flex software  shows any more than 70%, you are likely to have some problems.  I also found that any background programs such as virus software, etc which variable uses resources can cause problems.  I used a junkbox computer with nothing but the software running- no more stuttering, lockups, etc for over a year.  Just my comments.


Title: RE: Sold my Flex 3000
Post by: W4HIJ on May 24, 2013, 01:16:48 PM
Funny, I had a Flex 5K running into a Kenwood TL-922A with nothing but the stock ferrites on the firewire cable and two extra ones on my PC speakers and never once experienced RFI issues. See, I solved my RFI issues with the TL-922A way back when it was being driven by the Kenwood TS-450  that I inherited from my Dad along with the amp. Never once since then did they reappear, even with the 5K. Wonder how to explain that one?  Oh yeah, I must be a liar right? Maybe I'm just lucky or something. Hmmnn...wish that luck would carry over to the lottery where I could afford a 6700 and a new tower!!  :D :D
73,
Michael, W4HIJ


Title: RE: Sold my Flex 3000
Post by: SWL2002 on May 25, 2013, 02:30:36 AM
Funny, I had a Flex 5K running into a Kenwood TL-922A with nothing but the stock ferrites on the firewire cable and two extra ones on my PC speakers and never once experienced RFI issues. See, I solved my RFI issues with the TL-922A way back when it was being driven by the Kenwood TS-450  that I inherited from my Dad along with the amp. Never once since then did they reappear, even with the 5K. Wonder how to explain that one?  Oh yeah, I must be a liar right? Maybe I'm just lucky or something. Hmmnn...wish that luck would carry over to the lottery where I could afford a 6700 and a new tower!!  :D :D
73,
Michael, W4HIJ

What a mental case.


Title: RE: Sold my Flex 3000
Post by: AB4D on May 25, 2013, 10:23:40 AM
Funny, I had a Flex 5K running into a Kenwood TL-922A with nothing but the stock ferrites on the firewire cable and two extra ones on my PC speakers and never once experienced RFI issues. See, I solved my RFI issues with the TL-922A way back when it was being driven by the Kenwood TS-450  that I inherited from my Dad along with the amp. Never once since then did they reappear, even with the 5K. Wonder how to explain that one?  Oh yeah, I must be a liar right? Maybe I'm just lucky or something. Hmmnn...wish that luck would carry over to the lottery where I could afford a 6700 and a new tower!!  :D :D
73,
Michael, W4HIJ

What a mental case.

Why is he a mental case?  I recently picked up a used 5K, I also don't have any RFI issues at my station that affect the operation of the Flex 5000a/Power SDR.  Maybe it's the Alpha 9500 I use with the Flex. ;D  Perhaps some of us just have better station installations than others?  I'm not sure, but there are many happy owners of Flex 3000s and 5000s out there using them everyday, compared to the same few on here who keep recycling the same old complaints :'(





Title: RE: Sold my Flex 3000
Post by: K5TED on May 25, 2013, 10:46:34 AM
I've never actually connected powered speakers directly to my Flex 3000. I use the computer's audio system. I did put some headphones on the speaker jack once, and it worked OK. I prefer the computer's audio system where I can plug whichever sort of speakers, headset or headphones in, whether USB or analog. Much more versatility.


Title: RE: Sold my Flex 3000
Post by: W4HIJ on May 25, 2013, 06:42:55 PM
Funny, I had a Flex 5K running into a Kenwood TL-922A with nothing but the stock ferrites on the firewire cable and two extra ones on my PC speakers and never once experienced RFI issues. See, I solved my RFI issues with the TL-922A way back when it was being driven by the Kenwood TS-450  that I inherited from my Dad along with the amp. Never once since then did they reappear, even with the 5K. Wonder how to explain that one?  Oh yeah, I must be a liar right? Maybe I'm just lucky or something. Hmmnn...wish that luck would carry over to the lottery where I could afford a 6700 and a new tower!!  :D :D
73,
Michael, W4HIJ

What a mental case.

Why is he a mental case?  I recently picked up a used 5K, I also don't have any RFI issues at my station that affect the operation of the Flex 5000a/Power SDR.  Maybe it's the Alpha 9500 I use with the Flex. ;D  Perhaps some of us just have better station installations than others?  I'm not sure, but there are many happy owners of Flex 3000s and 5000s out there using them everyday, compared to the same few on here who keep recycling the same old complaints :'(




But ya see, that's not supposed to happen! Because a few disgruntled Flex users, most with the emotional maturity of three year olds, had issues then EVERYBODY is supposed to have them! If you're not having them then you must be a liar. On second thought, scratch the comment about three year olds.... I wouldn't want to do the poor children a disservice but comparing the whining sniveling little Flex bashers to them. ::)
73,
Michael, W4HIJ


Title: RE: Sold my Flex 3000
Post by: KA4KOE on May 28, 2013, 01:31:44 PM
I have a 500W SG-500 amplifier right next to my Flex 5000a. I've not experienced a single problem with RFI to the 5K.

PAN


Title: RE: Sold my Flex 3000
Post by: FORMER_N9KX_SM on May 28, 2013, 04:41:08 PM
Some of the disparaging comments found here regarding flex radios being the source of RF problems are a bit humorous and down right ridiculous. Yes, I own a 3000... bought a late serial number unit used and have owned it for over a year with no problems. I never had RF problems before the flex or now... even with my legal limit amp running full tilt. Maybe that's because I designed my station according to the best practices found in the handbook - grounding, power, cabling etc... I don't know. The second important thing to remember is that the manufacture has minimum computer hardware requirements for a reason... and if you don't abide by them you'll have a bad experience. If you try to use an old junk computer then you won't be happy with the radio. PowerSDR will lockup... audio problems and all sorts of weird anomalies. Use a PC with a high end dual core CPU, 4GB memory min. and a good fire wire adapter from their list... then everything works as it should for me and you.
Good Luck!

73's
N9KX



Title: RE: Sold my Flex 3000
Post by: W4HIJ on May 28, 2013, 05:20:17 PM
KA4KOE, N9KX.... You guys are obviously liars! :D :D But seriously the large majority of  Flex users don't have RFI issues and ANY brand of radio can have RFI issues. Adding a PC into the mix certainly complicates things a bit but as long as you do your due diligence in station setup and design, you can eliminate any issues as the three of us and countless others have proven.
73,
Michael, W4HIJ


Title: RE: Sold my Flex 3000
Post by: FORMER_N9KX_SM on May 31, 2013, 12:09:43 AM
W4HIJ -

I had a positive Flex experience and shared it...

It's no skin off my backside if you believe me or not, so here is a small dose of reality for you...

Someone isn't a liar just because their experience is different than yours. The fact of the matter is they may know more about the subject matter than you. Ask questions and find out why others were successful and you weren't. That light bulb might just turn on for you. Also, try to put some effort into formulating an intelligent response that supports your side of an argument without the insults. You will find you're received much better.



























 






Title: RE: Sold my Flex 3000
Post by: W1JKA on May 31, 2013, 03:15:45 AM
So the bottom line appears to be that some hams like me that are not completely computer literate or savy should shy away from Flex radio,I'll take that as good advice and stick with my K-1.Thanks for the warning and entertainment.


Title: RE: Sold my Flex 3000
Post by: W4HIJ on May 31, 2013, 02:27:51 PM
W4HIJ -

I had a positive Flex experience and shared it...

It's no skin off my backside if you believe me or not, so here is a small dose of reality for you...

Someone isn't a liar just because their experience is different than yours. The fact of the matter is they may know more about the subject matter than you. Ask questions and find out why others were successful and you weren't. That light bulb might just turn on for you. Also, try to put some effort into formulating an intelligent response that supports your side of an argument without the insults. You will find you're received much better.

Whoa there.... you took me totally the wrong way and misconstrued my comment.  I was joking. Hence the  :D :D icons after the liar comment.  I totally agree with you that someone isn't a liar because their experience is different from yours. From day one I owned my Flex 5K and hooked it up to my TL-922A  I never once experienced an RFI issue because I had already solved them several years before.
My reference to people having good experiences with Flex radios being liars stems from the situation here in this forum where  a group of Flex bashers and especially one cowardly individual in particular insist that  they are the only ones who tell the "truth" about Flex radios  and that anyone who has a different experience with them and relates it is a liar. You and I are totally on the same page but please accept my apology if my comment came across the wrong way. I guess I forget that sarcasm doesn't always translate well when it is typed rather than being spoken.
73,
Michael, W4HIJ

























  


Title: RE: Sold my Flex 3000
Post by: AB2YC on June 03, 2013, 11:12:17 AM
I have the Flex-1500 and an amp, I don't have any issues with RFI and the Flex.

I have been quite happy with the Flex.



Title: RE: Sold my Flex 3000
Post by: AF4RK on June 10, 2013, 02:11:29 PM
I run an Alpha 86 at 1 KW with a Flex Radio and the antenna, (43' vertical) is 10 feet from the operating position. There is a lot of ferrite but it's mostly for the computer. And I have NO PROBLEMS! I run 1 KW just to be conservative so the amp will last longer.


Title: RE: Sold my Flex 3000
Post by: W6UV on June 10, 2013, 02:45:17 PM
I run 1 KW just to be conservative so the amp will last longer.

Many tube amps will dissipate more power at lower power output settings than they will at full power, so I doubt that you're extending the life of the amp and/or tube(s) by doing this.


Title: RE: Sold my Flex 3000
Post by: W8JX on June 10, 2013, 09:14:36 PM
I run 1 KW just to be conservative so the amp will last longer.

Many tube amps will dissipate more power at lower power output settings than they will at full power, so I doubt that you're extending the life of the amp and/or tube(s) by doing this.

Not so, they might have slightly lower efficiency but peak dissipation will be lower. I will say this though, ceramic power tubes wear out at same rate (based on cathode emissivity decreasing with time) transmitting or on standby so you are not saving tube life.


Title: RE: Sold my Flex 3000
Post by: W4HIJ on June 11, 2013, 04:55:07 PM
I find it extremely interesting that now that we have post after post about folks running Flex radios with high power and having no RFI issues that the Flex bashing club is strangely silent. Not that I'm complaining. I guess the little children don't like it that the game is no longer being played their way so they took their toys and went home! ;D ;D Good riddance too! ::) ::)


Title: RE: Sold my Flex 3000
Post by: KF6QEX on June 11, 2013, 05:18:27 PM
I guess you can't leave well enough alone? There haven't been that many posts and some even admit having to use ferrites. All in all a day late and a dollar short. You could have kept your extremely interesting observation to yourself and let the events speak for themseves...but since you have to point it out...hmmmm


Title: RE: Sold my Flex 3000
Post by: K5TED on June 11, 2013, 05:37:31 PM
Something that occurred to me... I wonder how many shacks have a DSL or cable modem connected to the shack PC via ethernet cable.. That's one big path for RF going out the antenna, into the house telephone UTP or RG-6 shield, back into the consumer grade DSL or cable modem, which are not particularly well shielded, and on into the PC and attached Flex radio...