Fig 1: Heathkit HM HF RF Power Meter. The HM Meter for VHF is SImilar. Part #. Began Ended Frequency MHz. Power Watts. Notes. HM The Relay Modification Kit [PN ] is available from Heath Parts . March 2, HM Bulletin No: VHF Watt Meter HM MODEL HM VHF Wattmeter ASSEMBLY MANUAL Copyn^it Heath Company All rtghtt restrved HEATH COMPANY PHONE.

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Resistors R7 and R8 are voltage dividers for the two power ranges: Apply power to the transmitter and tune it for maximum RF output reading.

I need help setting the swr sensitivity. Resistor R3 forms a load across coil L1 to reduce the Q of the coil circuit.

VHF Watt Meter HM-2102

If the transmitter output tuning adjustments will not accommodate this impedance range, the transmitter will be difficult to load until the load is properly matched to the line. Cut off the excess lead on the component side. Position this capacitor vertically against the circuit board as shown. Shipping cost cannot be calculated. Email to friends Share on Facebook – opens in a new window or tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab Add to watch list.

VHF Watt Meter HM Amateur-D Heathkit Brand, Heath Co.;

Ship by prepaid express. Remove the paper backing from the bu,letins and white label; then, press the label firmly onto the bottom of the cabinet as shown on Pictorial 5. An external wattmeter may be used with transmitters at frequencies of 50 to MHz and power up to watts. Cut one lead of a 7.


Heathkit Service Bulletins – HG/HL/HM/HN/HO (Complete)

Capacitor C2 is increased to 16 pF for 2 meters and 17 pF for 6 meters. September 09, For additional information, see the Global Shipping Program terms and conditions – opens in a bulletinx window or tab This amount includes applicable customs duties, taxes, brokerage and other fees. Connect this wire from the center pin of connector B NSthrough the eyelet in the circuit board, bulletuns into the center pin dip of connector A NS. Select a valid country. Cut 4″ from one end of the cable. Connect the black wire to the negative unmarked meter lug S Misleading readings may be obtained with long transmission lines since the losses in the cable tend to “smooth out” the standing waves, giving a much better indication at the transmitter bulletjns actually exists at the antenna.

Disregard the Power Bhlletins readings at this time. Check for bits of solder, wire ends, or other foreign matter which may be lodged in the wiring.

With a pair of long-nose pliers pull the wires out of the outer insulation. If an ohmmeter is available, check between the eyelet and one of the coil leads to be sure they are insulated. Detail 7B Refer to Detail 7B and place a ferrite bead over the bare end of the black wire. Merely place the FUNCTION switch in either the or watt position; then read the corresponding scale on the meter scale to obtain the power output of the transmitter. Delivery times may vary, especially during peak periods.


Use this nut starter to hold and start and nuts on screws. Jeffersonville, Indiana, United States.

A transmitted signal routed along this hsathkit induces a current in coil L1. Capacitors C1 and C2, diode D1and voltage divider resistor R1 through the calibrate jumper complete a voltmeter circuit for the wattmeter calibration.

Heathkit Service Bulletins – HG/HL/HM/HN/HO (Complete)

Capacitors C3, C4, C5, and C6 form a voltage divider circuit to balance the capacitive effects of the bifilar doubled windings in coil L1, which provides correct SWR readings. Note the identification number of the part R-number, C-number, etc. Therefore, many troubles can be eliminated by reheating all to make sure that they are soldered as described in the Builders Guide. Before you install ceramic nulletins, remove any insulation from the leads as shown.

Estimated on or before Wed. Do not force the eyelet. SWR reading while transmitter is off. Some of the circuit board holes and one capacitor will not be used. Just drop us a line or give us a call. Use the Parts Order Form furnished with this kit.