Fig 1: Heathkit HM HF RF Power Meter. The HM Meter for VHF is SImilar. Part #. Began Ended Frequency MHz. Power Watts. Notes. HM line of Heathkit SWR bridges and, later, power meters. The Heathkit HM SWR Bridge Meter: HM for VHF. . issue of RF, the newsletter of the. The Relay Modification Kit [PN ] is available from Heath Parts . March 2, HM Bulletin No: VHF Watt Meter HM
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It is frequently helpful to have a friend check your work.
VHF Watt Meter HM-2102
Connect the red wire between the positive meter lug S-2 and lug 1 of switch AD S See the partial schematic and the pictorial for installation.
With the switch on forward use hetahkit sensivity control to set this level to full scale on the meter and then switch to reverse and read SWR.
Please do not return parts to the factory unless they are requested. An item that has been hewthkit previously. An external wattmeter may be used with transmitters at frequencies of 50 to MHz and power up to watts.
A load must be connected to the output jack of the Meter. For this reason, assume that the highest SWR reading bulletun most correct.
Therefore, scrape away the colored protective coating from the foil where the small spacer will contact it.
Heathkit Service Bulletins – HG/HL/HM/HN/HO (Complete)
Twist the bare wire ends tightly and apply a small amount of solder to each end to hold the small strands together.
Please enter heathkiit valid ZIP Code. Trace each lead in colored pencil on the Pictorial as it is checked. September 10, Jeffersonville, Indiana, United States. This information is also valuable for antenna adjustments or to determine the frequency range of the antenna.
Insert the other end through hole K on the circuit board and solder it to the foil. The remote cabinet is not weatherproof ed. If one is not available, refer to “Replacement Parts” inside the rear cover of the Manual. The blue and white label shows the model bulpetin and production series number of your kit. You can obtain parts directly from Heath Company by writing us or telephoning us at Ship by prepaid express.
Other offers may also be available. Be sure to provide the Heath part number. Read more about the condition. When operating SSB, any indication with no modulation indicates spurious or parasitic emission, or poor carrier suppression. Misleading readings may be obtained with long transmission bul,etin since the losses in the cable tend to “smooth out” the standing waves, giving a much better indication at the transmitter than actually exists at the antenna.
This Wattmeter may be permanently installed in your transmission line and needs no other power source. Position clear of circle. Be sure the twisted pair of leads goes into the center hole. Do not overtighten the meter nuts, as the meter case can be broken.
A cross pointer meter which reads forward power and reflected power at the same time and also indicates SWR is much easier hesthkit use. Or, if you write a letter, include the: Some of the circuit board holes and one capacitor will not be used.
Please enter a number less than or equal to 1. Turn the Function SWR switch shaft to its center position. This is done by finding your operating frequency on the bottom line of the chart, and moving up to find the type of cable used.
Heathkit HM SWR Meter
September 09, There bulltin 1 items available. Seller information sleake Refer to eBay Return policy for more details. With a low SWR, the load that the transmitter sees is practically pure resistive.