We offer fancooled, aircooled, and oilfilled dummy loads also known as dummy antennas from the most. Heathkit assembly manual cantenna dummy rf load model hn. Be careful with old dummy loads kb6nus ham radio blog. If you really want to go all out i saw a modified cantenna with a coolant recover tank on the side.
A dummy load may appea r resistive or reactive to rf. List your items fast and easy and manage your active items x i will mail via usps 1st class mail in a. The cantenna acts slightly inductive at uhf but addition of a small capacitor cancels this inductive reactance. The lid of the can had the so239 conector and the board with the resitors. This was a common way back in the days to load up a transmitter off air. For heathkit cantenna antennarelated device, see dummy load. Decades ago, a company called heathkit released a dummy load, which is basically a shielded power resistor, used to safely absorb the energy from a. It extends in a narrow, 30 degree beam, to and from your target base station or access point. Vintage heathkit manual rf signal generator model ig102. Run continuous duty with 200 watts cw or 400 watts pep. Back in the 70s, i bought a heathkit cantenna dummy load kit.
Still a popular dummy load a staple in the shack of many hf operators is the dummy load, which allows tuning up a transmitter without interfering with signals on the air. There is little reason to go to the trouble of calculating the fluid needed for a 100w intermittent load. Anybody have the heathkit cantenna dmmmy load manual that i might get a copy. Heathkit manual cantenna dummy rf load model hn31 ebay. Anybody have the heathkit cantenna dmmmy load manual that i might get a copy i would like to repair and check out. As penson states, its hard to go to a flea market and not see. This article is part of wikiproject electronics, an attempt to provide a standard approach to writing articles about electronics on wikipedia.
Incidentally, the name cantenna was originally a joke. Book depository books with free delivery worldwide. Mid1959 found this author completing his first ham transmitter kit, a heathkit dx40. In radio a dummy antenna is connected to the output of a radio. The dummy load has been used for many years and remains in apparent.
This makes me nostalgic for my dads heathkit hw101 and cantenna builds from the mid 1980s i think this is a fun series of articles. Condition is used,dispatched with courier delivery. The dummy load comes complete with a derating curve. Second hand heathkit hn31 cantenna dummy load, heathkits classic oilfilled dummy load produced from 1961 through to 1983 when it was discontinued in favour of the hn31a. This is very popular in wifi as it is extremely easy to. My 40 yearold heathkit cantenna sprung a slow leak, and it did quite a bit of.
Basically, they were just a paint can into which you dunked a noninductive resistor. Hn31 cantenna model dummy rf load heathkit assembly manual. Heathkit hn31a cantenna rf load resistor dummy load for radio cb. Most of the tuning will be into a dummy load, or with v9 removed as the manual instructs. Cantenna hn31 amateurd heathkit brand, heath co benton h. The first operation was to modify the circuit shown in fig. Dec 24, 2015 you can learn a lot from a dummy load. Up for sale is new replacement transformer load oil for bird, mfj, heathkit, cantenna dummy loadscoaxial resistors, terminators and attenautors. We have dozens of these beauties that came from scientific radio that had been used around their plant. Notes on the heathkit hn31 cantenna figure 2 hn31 interior construction the load resistor the performance of the dummy load has mostly to do with the resistor characteristics. Cantenna dummy rf load complete manual vintage radio info.
Trees, metal buildings, drywall, power lines, and other objects may block your wireless signal and make the super cantenna. Anybody have the heathkit cantenna dmmmy load manual that i. Dear the we aim to it ane of the best in the your heathkit warranty during 20 of parts which in and pay shipping to in world, a defective to other. Heathkit cantenna dummy rf load model hn31 65952703 1965 original manual. Perhaps the inductive reactance of the bulb fooled the swr meter. I had some questions around heat dissipation and how i can calculate and. The manual for my johnson viking ii recommends using a light bulb for a dummy load and i would if i didnt have a heath cantenna on the bench. Optimizing the heathkit hw101, sb100102 transceivers, by mark graalman, wb8jkr, and len greenberg, wb8jcj. A cantenna is a homemade directional waveguide antenna, made out of an openended metal. However, in the vhf and uiif frequency ranges, per. Heathkit hn31a cantenna rf load resistor dummy load radio. Heathkit hn31 cantenna watt dummy load without oil sold at wood county parkersburg hamfest this dummy load is from the estate of john andy andracki, kb8er sk. I will combined shipping for a discount if multiple items are wonturbo listerthe free listing tool.
Free heathkit diagrams, schematics, service manuals. As a 16 year old novice, i used a 100w bulb as a dummy load. As penson states, its hard to go to a flea market and not see one cantenna. Dec 30, 2006 i have one and before puttting any transmitter on the air i first run it into the dummy load to see if it behaves as id expect. Discussion in general technical questions and answers started by no2v, aug 12. Loving the hobby i wanted to really learn how things work and especially how to test and trouble shoot my own problems. At high frequencies, these loads perform well and exhibit tolerable vswr. A bit of info the cantenna and other similar dummy loads are essentially a 50 ohm resistor that is nonreactive or noninductive and that can handle the power delivered to it. Heathkit schematic and manual archive vintage radio info.
I am interested in building one of theese and wondered if anyone has. I would also advise everyone to set the dummy load inside of another container. Ok i was looking through my friend now your talking book today and noticed it showed a dummy load constructed of a paint can containing resistors. A better heathkit cantenna improved metering circuit for an old standby update your dummy load. Decades ago, a company called heathkit released a dummy load, which is basically a shielded power resistor, used to safely absorb the energy from a transmitter without actually transmitting. The big dummy was very popular and was a good competitor to the heathkit cantenna, which had been sold as a kit for many years.
Bird 43 heathkit cantenna mfj dummy load resistor replacement. Such setups are widely used in wireless community networks for longdistance wifi links. Hn31a for sale heathkit unbuilt hn31a model cantenna. Heathkit cantenna electronics forum circuits, projects. In 1961 heathkit, using its quantity buying power, introduced the hn31 cantenna dummy load. One of these can handle continuous transmission at 200 watts, and up to ten minutes at one kilowatt. We offer fancooled, aircooled, and oilfilled dummy loads also known as dummy antennas from the mosttrusted brands in ham radio, including ameritron, diamond, mfj enterprises, palstar, and vectronics. What you were supposed to fill the can with was transformer oil. A dummy load is a device used to simulate an electrical load, usually for testing purposes. List your items fast and easy and manage your active items x i will mail via usps 1st class mail in a large format. It is a ceramic tube coated with a carbon graphite film that yields a nominal resistance of 50 ohms. Find great deals on ebay for cantenna and dummy load.
The cantenna was well received by the ham community because of its low price and high performance. If you are wondering what amateur radio is about, its basically a two way radio. They showed it taken apart but it had no oil in it. Heathkit hn31 cantenna dummy rf load assembly manual ebay. It extends in a narrow, 30 degree beam, to and from your target base. Many old favorites, including the cantenna dummy load, appear in the book. Antique radio forums view topic dummy load question. It can handle a full kilowatt for up to 910 minutes, depending upon the cooling oil used. I have one and before puttting any transmitter on the air i first run it into the dummy load to see if it behaves as id expect. If you would like to participate, you can choose to edit the article attached to this page, or visit the project page, where you can join the project and see a list of open tasks. Original 1962 heathkit hn31 cantenna dummy rf load ham radio instruction manual. Heathkit assembly manual hn31 cantenna dummy rf load 1962.
Equipment available updated 20190218 athens county ara. Heathkit assembly manual cantenna dummy rf load model hn31 unknown on. Im building my own dummy load, consisting of resistors submerged in liquid paraffin or something similar, not 100% decided. Cantenna hn31 amateurd heathkit brand, heath co benton harbor mi, build 19611983, 3 pictures, 1 schematics, united states of america, tubes. Both of these dummy loads provided a heavy noninductive 50ohm resistor that was suspended in a 1gallon paint can type receptacle filled with transformer oil and a coax socket on the top lid. The super cantenna is a directional, lineofsight antenna. The resulting setup is a lowcost highquality highgain antenna. Heathkit s classic oilfilled dummy load produced from 1961 through to 1983 when it was discontinued in favour of the hn31a. I noticed he didnt have a dummy load so i gave him an old heathkit cantenna thats been sitting in my garage for years. Heathkits classic oilfilled dummy load produced from 1961 through to 1983 when it was discontinued in favour of the hn31a. Heathkit assembly manual cantenna dummy rf load model hn31. I had removed the oil many years ago and as a result the container developed a lot of rust and corrosion. The cantenna was well received by the ham community because of its low. Heath cantenna for uhf information on heathkit and others.
A bit of info the cantenna and other similar dummy loads are. Chuck pensions book1 estimates that sales of the hn31 were in the order of. The manual for my johnson viking ii recommends using a light bulb for a dummy load and i would. A cantenna can be used as a satellite dish feed horn. Chuck pensions book1 estimates that sales of the hn31 were in the order of 200,000 units between 1961 and. Heathkit hn31a cantenna rf load resistor dummy load. Mar 27, 2011 i dont think the vent seal is critical but you can probably buy vent parts from mfj since they sell most parts for their products and their dummy load is very similar to the cantenna. The author provides a brief description of heathkits. The author provides a brief description of heathkit s origins but does not dwell too long on this subject that has been well documented by others. Second hand heathkit hn31 cantenna dummy load, heathkit s classic oilfilled dummy load produced from 1961 through to 1983 when it was discontinued in favour of the hn31a.
The wireless signal exits and enters the cap end of the super cantenna. Test your transmitter the proper waywith a dummy load from dx engineering. Second hand heathkit hn31 cantenna dummy load rw uk. The book shows using s vtvm for get this relic, use a modern dmm with same spec. I dont think the vent seal is critical but you can probably buy vent parts from mfj since they sell most parts for their products and their dummy load is very similar to the cantenna. Cantenna dummy load suitable up to 30 mhz and up to 1 kw the term cantenna originally referred to a product sold by heathkit co. Jun 08, 2007 i was in the process of helping a friend setup his station. Home page amateur radio museum equipment heathkit equipment. Heathkit cantenna rf dummy load resistor model hn31 cb radio test equipment. A book that has been read but is in good condition. If you would like to participate, you can choose to edit the. If you still want to use a fluid dummy load, then just use a liter or more, watch the temperature if you need to transmit for more than a minute at a time, and move on with your testing.
383 435 900 1331 715 288 1539 760 1104 5 1568 553 892 1429 452 961 274 1458 890 919 1539 940 401 409 742 353 743 237 1203 488 1410 1197 706 130 1448 1482 790 766 460 1233