Heathkit cantenna dummy load books

Had i known, i would have gone with the mfj branding and saved a few bucks thus 1 star off for misleading ad photos. I had some questions around heat dissipation and how i can calculate and avoid the thing overheating. Heath produced its first 2meter fm transceiver, the hw202, in 1973. I will combined shipping for a discount if multiple items are wonturbo listerthe free listing tool. List your items fast and easy and manage your active items x i will mail via usps 1st class mail in a large format. Many old favorites, including the cantenna dummy load, appear in the book. The mfj250 versaload kw wet dummy load lets you tune up fast. With 500 watts open air dissipation i have no idea. The resulting setup is a lowcost highquality highgain antenna. A cantenna can be used as a satellite dish feed horn. Basically, they were just a paint can into which you dunked a noninductive resistor. On a heatsink, with lots of tender care soldering to the tab, they are great.

Home page amateur radio museum equipment heathkit equipment. Search for oil for cantenna or oil for dummy load mineral oil works well for me. I drained the 5 gallons of silicone load oil and brought it home. Whatever you use, make sure the 50 ohm dummy load resistor or. Second hand heathkit hn31 cantenna dummy load rw uk. Heathkit assembly manual cantenna dummy rf load model hn31 unknown on. If you are wondering what amateur radio is about, its basically a two way radio. Well, i guess it does work but the can must be the absolutely cheapest one available on the market. Hn31a for sale heathkit unbuilt hn31a model cantenna. Such setups are widely used in wireless community networks for longdistance wifi links. Im building my own dummy load, consisting of resistors submerged in liquid paraffin or something similar, not 100% decided. Books by heathkit zenith educational systems heathkit zenith educational systems average rating 4. 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.

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. 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. 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. Run continuous duty with 200 watts cw or 400 watts pep. Discussion in general technical questions and answers started by k7urx, dec 4. Chuck pensions book1 estimates that sales of the hn31 were in the order of 200,000 units between 1961 and. Heathkit s classic oilfilled dummy load produced from 1961 through to 1983 when it was discontinued in favour of the hn31a. This original manual comes with a satisfaction guarantee. This heathkit hn31 cantenna rf dummy load original assembly manual, is in excellent condition.

This article is part of wikiproject electronics, an attempt to provide a standard approach to writing articles about electronics on wikipedia. Two apache work but need to be recapped and tuned up. I used to have a heathkit cantenna dummy load years ago so when i started working on radios again i thought this would be a reasonable replacement. Low power dummy loads may be built using standard carbon or film resistors. In 1961 heathkit, using its quantity buying power, introduced the hn31 cantenna dummy load.

It was either military surpluss or broadcast in origin and just fits nicely in a gallon paint can. Hn31 cantenna model dummy rf load heathkit assembly manual. Well, im now the proud owner of the first cantenna jr its fed with an rca jack on the top. 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 its a regular resistor, its generally has some inductance in it. Someone has linked to this thread from another place on reddit.

Although i do check every manual, it is possible i may not notice a missing page or flaw because i have so many original manuals to set up. 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. A dummy load may appea r resistive or reactive to rf. Heathkit hn31 cantenna rf dummy load original assembly. Normally in dummy loads, a noninductive 50 ohm resistor is used. The first operation was to modify the circuit shown in fig. Original heathkit cantenna model hn31a rf dummy load. My 40 yearold heathkit cantenna sprung a slow leak, and it did quite a bit of damage before i noticed something was amiss. 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 biggest and best ham radio classifieds on the web. The task of sourcing the appropriate oil fell to the buyer to purchase.

Find great deals on ebay for cantenna and dummy load. One of these can handle continuous transmission at 200 watts, and up to ten minutes at one kilowatt. Back in the 70s, i bought a heathkit cantenna dummy load kit. What you were supposed to fill the can with was transformer oil. I lucked out when we toasted a 10kw dielectric dummy load at work. Heathkit hn31a cantenna rf load resistor dummy load for radio cb. The cantenna acts slightly inductive at uhf but addition of a small capacitor cancels this inductive reactance. When ever i hear or read cantenna i immediately think of the old heathkit dummy load. I would also advise everyone to set the dummy load inside of another container. Ive got a small dummy load, but i wanted something that could more easily handle 5 watts for minutes at a time without breaking out the 200 watt dummy load and with a built voltage divider to feed the oscope. New designed hn31, artifical dummy load antenna for 1,5 to 450 mhz vswr 1. Radioanq selling 3 heathkit apache three heathkit apache for sale.

I went to a paint store and got another gallon can and that took care of the leak. Be careful with old dummy loads kb6nus ham radio blog. Beyond that an expensive, hardtofind, highpower noninductive resistor is required. Buy, sell, trade hf and vhf equipment, towers, antennas, rotators and more. Heath cantenna for uhf information on heathkit and others. Print ad heathkit amateur radio ham gear antenna tuner dummy load cantenna. Heathkit assembly manual cantenna dummy rf load model hn.

Cantenna hn31a amateurd heathkit brand, heath co benton. Heathkit hn31 cantenna dummy rf load ham radio vintage manual original. Heathkit assembly manual cantenna dummy rf load model hn31. The dummy load comes complete with a derating curve.

Thoughts about the heathkit hn 31 dummy load youtube. Condition is used,dispatched with courier delivery. I have a dummy load made from ten 500 ohm 50 watt globar resistors. Heathkit hn31 radio description hn 31 heathkit vintage cantenna for. Heathkit cantenna dummy rf load hn31a hamm radio vintage original fixed.

Built in an one gallon paint can, resistor submerged in 4l transformeroil. Heathkit cantenna rf dummy load resistor model hn31 cb radio test equipment. Heathkit hn31a cantenna rf load resistor dummy load. As such, its impedance would vary all over the place depending on frequency of use rending it highly inaccurate. The few industrial suppliers in my area monterey, ca want to sell me. We then take the new lid and put it on the cantenna with shipping clips, to. Books by heathkit zenith educational systems author of. It sold over 200,000 units in its first ten years and was described. A better heathkit cantenna improved metering circuit for an old standby update your dummy load. 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. Dummy load reading pwr output more accurate then bird meter duration.