I have been playing with a new Triquint ULNA device (TQP3M9036). It
Shows a lot of promise. It is like a MAR or MSA device in that it is
50ohm in and out. and has a claimed NF about .4db nf ( their numbers).
I have built several pramps to test them and have gotten even better
than they claim and they cover 50-1296 with ease and NF is .4ish or
below. The S11 and S22 are both great and the OIP3 is +35db also
...very nice device. It has great promise as a good terrestrial LNA.
Preamps are foolproof to build and would cost under $50 if all the best
quality parts are used.
Just for information only ...
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Hello all MoonNet users,
For those who are interested in SPID new firmware for use with all MD-0X
controllers and High Resolution Rotators (/HR models)...........
We do have available the brand new release version v2.0 firmware which
includes new futures and most important new exact pulse counting by
improved algorithm programming and as option additional unit for absolute
If you are interested, please drop me a email: frank.pa4fp(a)gmail.com and
will update you with the new firmware / User interface and new setup dox
Frank Postmus - PA4FP
have been thinking of getting solar installed and asked the company for their suppliers EME or EMC information. Need less to say I got a blank stare from the rep. I have also asked for an existing site to take the spectrum analyser and a receiver to visit.
Not being the first to journey down this path does anyone have examples of equipment that worked and/ or equipment that was found to cause interference?
Also are there any EMC standards relevant to home installations (or other) of solar?
Happy to chat off the list if people prefer.
I got a surplus coaxial relay type Amphenol 320-10831 as shown in photo. It
carries N connectors and seems robust.
I’m looking for its technical data, especially the power handling vs
Tnx es 73 de
that must be why I still use a drill and a vice to twist my 12VDC power wires for all things RF from LNAs to PAs. I was fortunate to get the dream job as a young ham leaving school of a 6 year radio traineeship with the government Department of Civil Aviation as it was called back in the day. A job that paid you while you studied and even better provided 3 months per year of their own training from component level repair to fault finding control, radio and navigation systems. The point was made that DC inputs always had to be twisted to minimise noise. And i have been doing this ever since.
I also remember back in around 1990 measuring crosstalk in 50 pair telco cables in high rise buildings. I was working for the national satellite company at this stage and we were competing with the then monopoly carrier to deliver intercity data services using last mile radio links (and interoffice satellite). Using the exiting building cabling in the building and then putting a 2mb/s service on copper was new and we were concerned that we would interfere with the existing POTS services that were on the commercial high rise building cabling. The 50 twisted pair cables were surprisingly effective at minimising crosstalk even thought they were designed with POTS in mind vs the Cat5/6 of today. The most common problems were when services were put on split pairs by mistake (normally bad design from a multi-pin connector from CPE to the MDF Main Distribution Frame).
Date: Tue, 26 Apr 2022 19:55:01 -0800
From: Ed Cole <kl7uw(a)acsalaska.net>
Subject: Re: [Moon-Net] Solar panel EME/EMC info
Content-Type: text/plain; charset=UTF-8; format=flowed
"Compared to a single conductor or an untwisted balanced pair, a twisted
pair reduces electromagnetic radiation from the pair and crosstalk
between neighboring pairs and improves rejection of external
electromagnetic interference. It was invented by Alexander Graham Bell".
That's why its used in computer cables (cat5e, cat6). I use twisted
pair wires striped out of cat5e for internal dc lines in my QRO amps
(and augment with ferrite beads).
Telephone industry has been using twisted pair wiring for a long time.
If I were installing solar-electric system, I would either use twisted
pairs or metallic conduit with ferrites at each end.
Ferrites do a good job where interference is conducted (vs radiated). I
use them with my switched PS. Upgraded my shack computer jumpers to
Sine wave inverters are better than square wave (but cost more). I'd
look for units with metal cabinets (and maybe add bypass caps and ferrites).
My home is about 90% LED lighting with no noise issues. I still need to
weed out the wall-wart supplies (build a multi-volt dc supply for those
appliances that are in the shack).
Shack PS are 12v-50A analog Astron, 28v-18A analog Astron, and 50v-62.5A
Meanwell switched PS for my QRO amps.
Would really be nice if someone would test all the solar-electric
appliances for EMI Noise and publish it (sure many of us would purchase
that). ditto for LED lamps.
73, Ed - KL7UW
The EU EMC Market Surveillance links are interesting reads thanks for sending. Depending on the year 25% or 33% percent ’technical compliance’ is really a concern. If only the report listed the units that did not comply ;-). Downunder in VK its very much a user pays environment. The regulator here (ACMA) has been decreasing the numbers of radio inspectors and expects the carriers to find the source of interference in most cases even though they pay billions of dollars in spectrum licences. Indeed I was surprised when the ACMA said they would conduct field strength measurements for my recent high power permit. I expected to have to submit these my self. Maybe it was when I said I would use a HP power meter and horn antenna? They turned up with a $100k NARDA selective RF level meter that really stood out in my neighbours front yard!
Date: Thu, 28 Apr 2022 13:00:10 +0300
From: Lasse Nyberg <oh6ktl(a)gmail.com>
To: Greg McIntire <aa5c.mcintire(a)gmail.com>
Cc: pmanfre <pmanfre(a)gmail.com>, Jim Schatzman
<james.schatzman(a)futurelabusa.com>, Jim Schatzman via Moon-net
Subject: Re: [Moon-Net] Solar panel EME/EMC info
Content-Type: text/plain; charset="utf-8"
been in same plans regarding solar pannels and inverter problematic and i
took directly contact to Finnish Safety and Chemical Agency (Tukes) and
there they among said brands like Fronius and SMA was
doin good and no spook from them , also they paased me whats been on with
test inside in European union
could be one idea to all to take contact directly to own countrys Safety
Agency to then get right info what inverters been accepted
I've been reading the posts on Solar Panels and RFI. I'm not really affected much since I don't operate HF. I no longer operate on 144 since the local noise level is high anyway. I moved off 432 eme for similar reasons. I now operate 1296 EME and 10Ghz EME (Rx only) where thing are currently still fairly quiet, though 1296 shows quite a few birdies, but no overall noise floor rise. In the future that may change since we live in an increasingly RF polluted word. 10Ghz is still very quiet.
I've looked at the issues of RFI from solar arrays in case something local crops up. It seems like that can be minimized if whoever installs them takes enough care and used the right components. That that probably means higher costs and a lot of people probably won't go the "right" route and prefer to save money. The lowest bid on a contract usually wins it.
It doesn't really look like the FCC regulations help a lot either (even if they could be enforced). The rules and test proceedures are so complicated they are hard to understand, the FCC is unlikely to get involved in this type of issue anyway, and it's likely that the FCC part A and B regulations allow enough RFI to interfere with EME operation anyway. That's why there are quite zones around radio telescopes where they don't want use of any RF generating devices, whether or not they pass the FFC certification rules. For some reason it also seems that solar power systems may be exempt from FCC part B certification too, so that leaves the door wide open for legal RFI levels that can pretty much wipe out weak signal work.
Here are some useful links that I've collected.
Can Home Solar Power and Ham Radio Coexist? - Fair Rite<https://www.fair-rite.com/wp-content/uploads/2020/10/Brock-Fisher-April-201…>
QST® – Devoted entirely to Amateur Radio www.arrl.org April 2016 33 Tony Brock-Fisher, K1KP When retirement came around, we decided to make significant renovations to our home, including adding a whole-house solar
Solar System RFI - Palomar Engineers®<https://palomar-engineers.com/rfi-kits/solar-system-rfi>
The Problem As solar photovoltaic (pv) system installations are becoming more popular, solar pv radio frequency interference (RFI) is also becoming more evident and effective RFI suppression techniques are needed to ensure the performance of electronic devices connected to or in the presence of the pv system. Grid Tie and off the grid solar systems […]
Some of my neighbors have older Solar City installs. Those installs all produce noticeable and annoying EMI. I checked out a couple of newer installs driving by with a portable spectrum analyzer and they seem to be pretty quiet. They use Enphase Energy IQ7PLUS inverters.
Two other installers around here use central inverters:
Solar Edge "single phase inverter"
No useful testing results available from either mfr. Solar Edge claims it "synthesizes a clean sinewave". I don't have any data I collected myself.
a) All inverter mfrs say that they are Part 15 compliant. Don't believe it - or if it is true, it is unhelpful.
b) IMHO, all electrical wiring should be run in metal conduit. This seems to be a problem and only some installers in some areas do it. It is up to the local authorities to determine the requirement and installers aren't likely to do anything extra.
Overall, in my neighborhood, the solar inverters seem to contribute slightly to the ambient RF. Worse are:
a) Stop lights at major intersections. They are unbelievably horribly noisy. I suspect you could see them from the moon with a modest size dish.
b) Sodium vapor street lights on aluminum poles.
c) Misc equipment inside peoples houses such as Chinese grow light inverters (horrendous), Chinese battery chargers (horrendous), cable modems (the next door neighbor had one for years that drove me crazy), switching wall warts (varies), fluorescent lights (bad), the odd electric pendulum clock, etc.. A big problem with a lot of this stuff is that it turns the electrical wiring in the house into a massive RF radiating antenna structure.
If only the FCC would do something useful and inspect Chinese electrical devices before allowing them to be sold in the country, I am convinced that average RF noise levels would go way down!
Two things discourage me from going solar:
a) Cost is still pretty high per kWh.
So I signed up for a solar garden. I am sure it produces RFI - just nowhere near my QTH.