Re: 2m/440 cw/ssb qrplabs kit?
On Thu, Jan 2, 2025 at 07:59 AM, Yannig - F4IUJ wrote:
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I think that if Hans were to fill the spare space in a QMX+ box with a 2m/70cm transverter or TRX
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Dave, W2KV and I installed a 10 watt 2M transverter inside of a Uniden President HR2510 radio back in the '90s.? Maintained both 10M and 2M operation.
Should be a piece of cake in the QMX+.
73, Don N2VGU
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
I would purchase one if another group buy materializes.
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KV4TT - Mike
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Re: AB8DF CW Practice / Rag Chew 1/2/25
Condx poor. Maybe next time. I think I might try 20 meters if I can figure out a good time of day for it. Like the idea of operating where Techs have CW privileges and tempting them to get into CW Ed
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On Jan 2, 2025, at 1:26?PM, WB0ZJJ-Alan via groups.io <alanmcdonley@...> wrote:
? Hello ED ES ALL,
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Your invite got me out to my backyard for a “portable ops dry run”, so thank you for the inspiration. ?Unfortunately prop did not seem to cooperate to reach South Florida.
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Re: AB8DF CW Practice / Rag Chew 1/2/25
Hello ED ES ALL,
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Your invite got me out to my backyard for a “portable ops dry run”, so thank you for the inspiration. ?Unfortunately prop did not seem to cooperate to reach South Florida.
?
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
Would also be interested if anyone decides to kit... if not, I may, with permission, try to put some together, but that would probably be at least a few months away.
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Bob
KG5GTE
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Re: Wanted: low power 50 MHz. linear amplifier
Besides the QRP-Labs 10w kit, which I see was discussed on another group as an option, (and qrpbuilder.com is using one on 6m, reportedly), there are options from 60dbm.com. Not the cheapest, but ready to go RD16HHF1 based 10, 20 and 50w boards, and even a cased version for 10w:
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Also, Mini-Kits down under has a 16w kit:
Their tests go up to 100 mhz...seems it'd be workable on 6m with the right cap value for C17.
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-Nate?
N8BTR
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On 1/2/25 I had a CW practice / rag chew
session on 40 meters. I worked three stations:
Conditions were very poor. SSN = 163, SFI = 219, A = 86, K = 5
so the band was pretty noisy.
I will be doing another CW on the air practice session Friday
01/03/25 . Anyone is welcome. This practice is intended
for operators who are new to CW or they need some practice. IT
DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists
are OK. Slow speed is OK. Really slow speed is OK. This practice
is meant for you to improve your CW. I will do my best to adjust
to your skill level. Operate at any power level. If several
stations show up, I will operate as a round-table control
station. I will do it as a round-table so everyone gets a chance
to transmit. Please listen to my directions.
Details:
Time - 10:00 AM Eastern Time / 15:00 UTC
Band - 40 Meters
How to find me - I will find a clear frequency and call CQ. Go
to the Reverse Beacon Network and search for my call sign AB8DF.
That will tell you what frequency I am on.
Tune your station to that frequency and if you hear me give me a
call. If there is a QSO in progress, please wait for a break in
the action. Then send your callsign. If I hear you, I will
invite you to join the QSO and start a round-table QSO.
Reply to this email if you have questions.
IT DOES NOT MATTER HOW POOR CW IS
Ed
AB8DF
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Re: QMX(+) Build experience, Poor Audio Filter Sweep/RF Filter Sweep/Image Sweep/ADC IQ test and resolution with new PCM1804
Hans,
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Looking at web hits for PCM1804 failures other than on QM* products, I only see low level noise issues.
What's being reported in this forum is complete failure.
A 15% failure rate is nuts.
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When final test detects a problem with the PCM1804, do they replace it with stock you buy from directly from TI?
Do these parts also fail in the same way at a 15% rate?
It could be your assembly house is sourcing what they believe are parts from TI, but they are counterfeit.
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Have you looked at the PCM4202?
Claims to be pin and function compatible with the PCM1804, $3.20 US direct from TI at 1K quantity.
From the dates in the datasheet, it came out a couple years after the PCM1804.
Being almost identical, it makes me wonder why they bothered to do this.
Page 23 of the datasheet shows differences between the two parts, none of which look like a problem.
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The PCM1804 and PCM4202 are both over two decades old, TI has the much newer
PCM1820 and TAA5242 parts that might be considered for future QRP Labs products.
Those are very small with a 0.5mm pin pitch and a center ground pad, much harder to work with.
But perfect for a possible QMXnano, to be stuffed into the traditional Altoids tin.? ;-)
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Jerry, KE7ER
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On Wed, Jan 1, 2025 at 11:22 AM, Hans Summers wrote:
Nuts, yes! Welcome to my life.?
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
Please include me in the next buy. Many thanks and 73, Mitch NK3H
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Hi Chris,
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I am not sure why there is a difference of peak voltage on the lower frequency bands unless it is due to higher gain at lower frequencies.?
I would be hesitant the to change the finals in the QMX line of radios, as Hans has developed a CESSB algorithm that is based on the BS170 characteristics. ?The QDX and QCX do not have this restriction.?
73
Evan
AC9TU
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Re: 2m/440 cw/ssb qrplabs kit?
Tiny SA is fine for HF - VHF harmonic level compliance checks PROVIDED that you know what you are doing.?
Basically there's a very narrow window of absolute input powers where both a main carrier and a harmonic 50 0r 60dB smaller can both be believed and measured accurately at the same time on a tiny SA and also a need for a test environment, cabling and external input attenuators that perform the same at each frequency under consideration.?
Everyday someone posts their 'results' to the internet using a telescopic receive antenna, way wrong input levels, DIY attenuators / taps? or other crazy methods settings as a way of demonstrating what they don't know . .?
Back in the day it was a full day's course to even? 'basic qualify' to make required measurements on a spectrum analyser.? ?
Today . . .? Just go for it mate !
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It makes more sense to make the change on a QMX+ since on 80m and 160m the peak voltage, even with 1:1 SWR exceeds the BS170 maximum voltage rating.
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Re: 2m/440 cw/ssb qrplabs kit?
On Tue, Dec 31, 2024 at 03:44 AM, Curt wb8yyy wrote:
Spurious regulations are tougher in this spectrum because it's used for public safety. Perhaps a tiny SA may not be good enough. So filters might have to be factory aligned. Perhaps better to assemble entire vhf uhf rig at the factory.?
A 144 MHz transceiver that could also receive 432 MHz might be interesting.?
But the entrepreneur gets to decide what is viable.?
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Curt
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Hi Curt,
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I can't see why a tinySA wouldn't do the job, I think that its dynamic range is 70dB, that might not be good enough to measure the good quality cavities of a 2m repeater but plenty enough to check the harmonics of a TRX.
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I think that if Hans were to fill the spare space in a QMX+ box with a 2m/70cm transverter or TRX, he would have the successor of the FT817!
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73,
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Yannig - F4IUJ
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As Harold mentions, it can be done with TN0110s, I've done so in several QDXs. But I would NOT do this in a QMX.
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-Nate
N8BTR
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Wanted: low power 50 MHz. linear amplifier
I'd like to acquire a 10 - 50 watt linear power amp to use with a 50 MHz. beacon transmitter. Input must be in the 10-18dBm range. Kit or assembled or "needs repair" is fine.?
Suggestions?
Thanks,
Robin K4IDC
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No it would just be difficult to make it work?
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Re: 2m/440 cw/ssb qrplabs kit?
Why not just get a transverter?
There was a ham in Ukraine that had a store before the war started. No one else seems to be interested in picking up that mantle (that I’m aware of).
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Did not investigate the component TN0110 further, but may provide opportunity in combination with an "U" shaped heatsink instead of a washer when installed in a neat way.
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Harold PE1RJP - Happy QMX+ owner
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
I’m interested in one full kit, if another group buy happens. Thank you for what you do!
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tom KE5CW
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Re: I damaged my QCX mini
Rick, the 0603 size (first checked item) would be the easiest to work with. If you have a small leaded 150 ohms resistor, you might be able to solder it in that spot if clearances work out too. Good luck .. 73 .... Ron
Hi all,
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I was trouble shooting a problem with my QCX mini for 20m Rev. 3 board T1.09a
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When I would push down on the tune rate knob or even? touch the knob to adjust the volume the volume would drop off.?
So, I thought being inexperienced, I had probably made a cold or ineffective solder joint.
I went in and examined the solder joints closely. As I went along I touched them up.
I plugged it in and things seemed much better, however, after? short time I was unable to access the menu. I could pull the power and then re-plug it in and have a short time to access the menu, then it would fail again.
This seemed like a problem that Lidiette, was experiencing. I connected it to a dummy load, but the same thing occurred. I unplugged it.
I took it out of the metal enclosure plugged it in again and suddenly I had access to the menu, no problem for as long as I wanted and the volume problem didn't come back.
So, I thought that perhaps something was touching the metal case.
I had added a jumper wire to gain the battery icon on screen. It was loose.
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From the construction manual-
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"For normal operation of the radio, if you wish to see a
battery voltage icon on screen, then connect pin 1 to pin 3
of the 4-pin header. This connects the voltmeter input to the
12V supply of the radio."
In trying to repair it I slipped with a small scrapper I was using and took R41 smd off the board. Ouch!
It's 150 ohms, on the top of whats left it says 151.
I've added some attachments I hope they are viewable.? Are either of the check marked resistors an acceptable replacement for R41?
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Thanks,
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Rick
KC6UXI
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Donald S Brant Jr
Mike (KV4TT)
WB0ZJJ-Alan
Bruce Akhurst
Robin Midgett
PE1RJP
Ronald Taylor