The transmit IMD will be better if you can get close to 13.8 volts, (or even
15.0 volts) to the PA, compared to 12.6 volts. 13.8 +/- 10% is 15.18 volts (
12.42 volts). Mobile radios will certainly see higher than 13.8 volts, so it
isn't like it will blow up at 15 volts. 7, Rob, NC0B
I would like to see some concrete data on that. If you have a 100 dB
radio, how could a preselector give a night and day improvement? That
seems on the surface to be illogical. I will have an FTdx-5000D here
within 10 days, but I don't think the ham who is loaning it to be
purchased the uTune.
It is similar to the slug-tuned front end of a Drake or Collins circa
1960s / 1970s. On 160 meters it will knock down the BC stations. It
will have a fractional bandwidth effect, so as one uses it on the higher
frequencies (they only go to 20 meters?), the bandwidth of the filter
will get wider
There are several Tokyo High Power linears that work well with QRP rigs.
http://k9ni.co.cc/thp/qpamps.html
My brother-in-law has an HL-50B that works well with his FT-817 and K2.
Many of these have problems with our FCC rules, as they can be used by CBers.
I believe you can order them direct from
I got rid of four 100 foot CAT 5e cables and switched to Ethernet over
fibre to reduce my birdy problem. I have a Netgear FVS-338 ourter, a
6-port fibre switch and six fibre channel NICs, plus one fibre to copper
media converter. All this runs a 1 GB, as this is used stuff that was
affordable.
Rob Sherwood 4/11/2010 8:58 PM
If you are doing serious 6 meter work with the Flex 5000, why not just add a 1
to 0.5 dB noise figure preamp? Isn't there a loop-through circuit for easy
insertion of same? Elecraft has a very nice 6 meter preamp ($150), and I am
sure a quick look through
I got tired of RF problems, mostly radiated birdies from the router / switch
into the higher HF bands and switched everything over to fibre channel. (Used
surplus stuff that was not too expensive.) It really helped but did not 100%
get rid of the birdies. The other reason was to reduce the
Keying sidebands are very much affected by the rise time. On the Omni-VII, for
example, if set to 10 mSec the width at -70 dB is about 900 Hz, but if set for
3 mSec it is 1500 Hz. Who knows how fast the FT-1000 is, but likely much
faster than 3 mSec. 73, Rob, NC0B
dan edwards w...@att.net
The 2.44 kHz spur does exist, and it is particularly noticeable on 160 meters
where local signals can be extremely strong. I measured it on a 5000A some
months ago, but did not test the 3000 on transmit. If my memory is correct,
the spur was down around 57 dB on 160 meters, but since I did
The review problem is greater than just a novice ham reviewing newer
technology. The person who reviewed the IC-7600 did not understand what
roofing filters are supposed to do. We have also gotten to read completely
unsupportable statements over the years, such as comparing radio B to radio A
I have been fighting RFI from my computer system at my rural QTH for two years.
(4 logging PCs in the ham shack, 1 family PC, 1 file server and a Motorola
Canopy wireless Internet link with a 10 mile hop to my access point.) The
spurs were quite annoying on 20 meters and up, all of which went
Here are my measurements over the weekend on a Flex 5000A as far as the affect
of the AGC-T setting.
The AGC-T is AGC threshold. There was no difference between 100 and 120 on my
unit. Below 100 there is a normal progression of a higher threshold.
Reading Threshold for 3 dB audio drop from
. 73, Rob
Sherwood, NC0B
Jerry Flanders jefland...@comcast.net 7/5/2009 8:20 PM
I guess you actually took the risk back when you tried the SDR-1000's, then.
Actually, it seems pretty clear the 5000a has a _very_ strong front
end, but that doesn't reduce the need for numbers. To me, it seems
and those intending to operate
full duplex like myself will be able to meter their RF levels and relax.
Jerry W4UK
At 07:54 7/7/2009, Rob Sherwood wrote:
A multi-multi wanted to know what level a Perseus would tolerate,
and Nico said +20 dBm. +30 dBm is 1 watt, and that is a lot of
RF. Contesters
I have not noticed a noise floor increase from my Netgear FVS-338 router with 8
port switch, but it sure has birdies on the higher bands. (This is a wired
network with 4 PCs and 1 file server, not wireless.) All I have tried is those
snap-on ferrites, not winding the RJ-45 cable multiple
I use a Heil GM-5 (HC-5 cartridge) with my Pro III with no problems with
VOX. I used that rig ½ the time in the recent CQ 160 meter SSB contest
with the VOX all the time. 73, Rob, NC0B
Dan Eisenman k8...@allprophoto.net 5/3/2009 11:06 am
So what's a good Mic for these rigs , I'm currently
The HP 400EL is not an RMS meter. That would be an HP 3400A. 73, Rob, NC0B
W7CE w...@curtiss.net 3/14/2009 8:34 am
Kevin,
The preamp is connected to RX1 in/out. I did some comparison tests between
Ant1 and Ant3 but could find no measurable difference. I've thought about
moving the
re: Contest signal reports.
Every contest where the required exchange includes a signal report has the same
issue. No one gives out real reports. But something else is usually required,
like a zone, a state, an ARRL section, or a grid square, like in the Stu Perry
160 meter CW contest. Of
A few comments and a question.
RFI sources at my quiet rural location come from computer-related items. Some
birdies and several kHz wide buzzing noises come from the computer and are at
least partially video related. Changing what is on the logging computer screen
sometimes affects the RFI.
How long is the cable between the 8640 and the radio?
Do you have a cap on the counter output on the back of the 8640?
I often see a 1 dB variation between measurements made with a 30 minute warm-up
and an 8 hour warm-up.
The change can go either way.
I usually double check the noise floor
I have been testing the Perseus and will be testing a Flex 5000A again in the
near future with an HP 7800 quad core. It comes with Vista, but you can get
free XP downgrade CDs from HP. XP downgrade option will be around for
about 1.5 years from many OEMs. Maybe by then Vista will be
While you can not buy an HP professional PC with XP through the distribution
channel, you can get a free set of CD/DVDs from HP that installs XP. That
replaces the pre-installed XP downgrade that was available until recently.
Microsoft can now claim that Vista is selling like mad, even though
Assuming one plans to drive a linear with the rig in class A, current rigs on
the market are rated at 200 watts in B or AB, and 75 watts in class A.
Examples: FT-1000 Mk V or FT-2000D.
k5nwa [EMAIL PROTECTED] 7/14/2008 6:33 AM
At 12:45 AM 7/14/2008, Tom Thompson wrote:
k5nwa wrote:
If the League graph cannot display better than -35 dB PEP, how does it test a
FT-1000 Mk V in class A? It has phenomenal numbers. Real measured data on the
rig owned by W6XX shows 3rd order -48 dBc and 5th order -76 dBc. Not only
should we look at 3rd order numbers, but the higher order
Error.
Those numbers were PEP, not dBc. Sorry.
73, Rob, NC0B
Rob Sherwood [EMAIL PROTECTED] 7/11/2008 11:12 am
If the League graph cannot display better than -35 dB PEP, how does it test a
FT-1000 Mk V in class A? It has phenomenal numbers. Real measured data on the
rig owned by W6XX
I don't know how the 5000 is affected by a small drop in Vcc, but the K3 3rd
order IMD degrades significantly with 1/2 volt drop in the cable.
Mike Schlamp [EMAIL PROTECTED] 7/10/2008 2:15 PM
Does anyone know, when using the built in voltage meter on the 5000A, where in
the DC power chain
Do you have any rigs besides the 5000 to compare with the fence on and the
blanker off? Most older radios do not react to the same degree as newer
ones. Case in point, Pro III often barely reacts, but IC-7000 and 7800 really
get a major AGC excursion to the impulse.
Rob
NC0B
[EMAIL
At least the solution was free. I had to make a computer service call to fix a
dead HP scanner that ended up being turn off. That call was not free!
73, Rob, NC0B
FireBrick [EMAIL PROTECTED] 2/22/2008 4:31 PM
That's dumb with a capital B.
yeah B, that's how dumB I am.
We had a very
I agree completely. Even more personal likes will make a big difference
between picking, say a Flex 5000A vs. a K3. The numbers are close enough to
make other issues tip the scales.
Bill Tippett [EMAIL PROTECTED] 2/20/2008 7:25 am
NC0B:
Is 2 kHz testing some magic number? No, but
that analog radios are history. Digital is just different.
73, Rob Sherwood, NC0B
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And, interestingly, Rob Sherwood agrees with you (If I can presume to
speak for him, based on my reading his commentary.. he'll probably
weigh in) He comments on the problem of making decisions on numbers
that actually have fairly high uncertainty.
Ok, I will weigh in.
The numbers gives
Here is a link to the Microsoft IE7 blocker program.
http://www.microsoft.com/downloads/details.aspx?FamilyId=4516A6F7-5D44-482B-9DBD-869B4A90159Cdisplaylang=en
All you need to do is run IE70Blocker.cmd from a command prompt.
You add a /b to make it block.
run IE70Blocker.cmd /b
Rob Sherwood
There is a program from Microsoft to block installing or asking to install IE7.
If the reflector will accept very small attachments, I could send it out. I
install it in every PC I take care in my IT business. Works on XP and Windows
2003 server.
Rob Sherwood, NC0B
Tim Ellison [EMAIL
How about a Lucky Strike Extra while you are waiting?
Jim, W4ATK [EMAIL PROTECTED] 10/17/2007 8:35 AM
I am so glad I did not sell my SDR-1000 on the expectation of my Flex
5000A. My order is #1238, so guess I will be waiting a bit longer. Will my
decoder ring never come
73 Jim
In case a Lucky Strike Extra goes back too far, here are a couple links:
http://members.cox.net/old-music/lucky-strike-extra.htm
http://www.radiohof.org/music/hitparade.html
Where's my cane?
[EMAIL PROTECTED] 10/17/2007 11:32 AM
Lucky Strike extra, nope. Lucky Strike Green has gone to War.
at +/- 3 dB. Gerald said he expected much higher numbers on
the 5000A, the way they divide down the LO, thus the comment on the possible
cause. I have no idea the cause.
73, Rob Sherwood, NC0B
Jim Lux [EMAIL PROTECTED] 10/6/2007 6:08 pm
At 03:49 PM 10/6/2007, Bill Tippett wrote
against publishing a 0 dBm measurement. In
the case of the FT-2000D, a -69 dB DR3 at 2 kHz becomes a +15 dBm intercept.
This is either confusing at best, or misleading. You decide.
73, Rob Sherwood, NC0B
Gerald Youngblood [EMAIL PROTECTED] 10/6/2007 7:03 pm
There are both misconceptions
manufacturers are back in the fray, competing with Japan, Inc.
73, Rob Sherwood, NC0B
Gerald Youngblood [EMAIL PROTECTED] 10/6/2007 7:03 pm
There are both misconceptions and apples/oranges measurements here. The IMD
DR3 numbers quoted by Elecraft are almost certainly measured using the ARRL
lab
Could you describe what your hear when your nearby neighbor is transmitting?
Does the radio become quieter? Do you hear noise? If he would work with you,
what happens if he were to put a full power carrier in the phone band while you
are listening in the CW band. Maybe he would be willing
a
flaw in this methodology? When Ten-Tec and I, and Elecraft and I both
measured the same radio, possibly by different methods, we got numbers that
were the same, within a couple dB.
73, Rob Sherwood, NC0B.
Jim Lux [EMAIL PROTECTED] 10/7/2007 11:34 am
At 07:29 AM 10/7/2007, Rob Sherwood
I am having problems sending the 5000A report to e-mail addresses that are
[EMAIL PROTECTED]
If you have requested a report via the League reflector, please send another
request via another e-mail address.
It does not seem to matter whether there are attachments or not.
73, Rob, NC0B
in impulse noise or QRN?
73, Rob Sherwood, NC0B
Lee A Crocker [EMAIL PROTECTED] 9/20/2007 6:06 AM
I'm not even sure the old way of analyzing receiver performance is entirely
germane to SDR because the radio is very different in system concept than a
standard analogue radio. Yes there are points
the
weak stations unreadable. Like night and day when the Pro 3 returned.
Look forward to comparing with the Flex 5K.
Jim K4JAF
- Original Message -
From: Rob Sherwood [EMAIL PROTECTED]
To: Flexradio FlexRadio@flex-radio.biz; Lee A Crocker
[EMAIL PROTECTED]
Sent: Thursday, September 20
, but the 706 sounded good and the 7000
did not. I hated to give up the excellent noise blanker in the 7000,
especially since it was my mobile rig, but the crazy sounds coming out of the
7000 trumped the excellent NB.
73, Rob Sherwood, NC0B
Bill Tippett [EMAIL PROTECTED] 9/18/2007 9:08 am
If you send me an e-mail, I will send you my test data.
Measured dynamic range is on 20 meters.
Noise floor with 500 Hz and 2400 Hz bandwidths and sensitivity (SSB bandwidth)
is included on 14, 10, 5, 2, 1 0.2 MHz.
73,
Rob Sherwood, NC0B
Ian Wade [EMAIL PROTECTED] 9/8/2007 11:39 AM
considerably slower.
Probably comes down to RAM. If RAM starved, swapping to HD would likely really
kill the program.
Computer hardware is always ahead of software.
Rob Sherwood
NC0B
Jerry Flanders [EMAIL PROTECTED] 8/22/2007 1:51 pm
Don't we already have a program to test the competence of the CPU
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