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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Learn More – opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc.

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

However, the accuracy of the external wattmeter will determine how accurate your Wattmeter will be. It is frequently helpful to have a friend check your work. Twist the bare wire ends tightly and apply a small amount of solder to each end to hold the small strands together. Sorry, we cannot accept collect calls.

Solder the leads to the foil and cut off the excess lead lengths. Reverse power readings are determined, in the same manner, by the circuit consisting bulletlns diode 02, capacitor C8, and resistor R5. This prevents the transmitted frequency from affecting the wattmeter.

Cut one lead of a 7. Improper load on wattmeter.

Heathkit HM Specifications |

Note the meter reading. Refer to eBay Return policy for more details. Your Warranty is located inside the front cover.


External Calibration Connect the external wattmeter. Position clear of circle.

VHF Watt Meter HM-2102

By looking at this hm-21102 level on the left-hand side of the chart, you hmm-2102 read the dB loss per feet of the cable at that frequency. Do not include any wooden cabinets or color television picture tubes, as these are easily damaged in shipment.

Connect the 3″ prepared end of this cable to the cabinet components in the following steps. This item may be a floor model or store return that has been used. Bring in the original part when you request a warranty replacement from a Heathkit Electronic Center. We warrant that, during the first ninety 90 days of ownership, our products, when correctly assembled, calibrated, adjusted, and used in accordance with our printed instructions, will meet published specifications.

Email to friends Share on Facebook – opens in a new window heaathkit tab Share on Twitter – opens in a new window or tab Share heatjkit Pinterest – opens in a new window or tab. The voltage formed in coil L1 is rectified by diode D3 and decoupled by capacitor C7 and resistor R4.

If one is not available, refer to “Replacement Parts” inside the rear cover of the Manual. The main difficulty with this type SWR meter is that you have to reset the sensivity control every time you make a tuning adjustment. Assembly and Operation of the. Delivery time is estimated using our proprietary bulletis which is based on the buyer’s proximity to the item location, the shipping service selected, the seller’s shipping history, jm-2102 other factors.


Heathkit Electronic Center facilities are also available for telephone or “walk-in” personal assistance. The circuitry includes an internal calibration facility for 2-meter and 6-meter bands.

See Figure 3 fold-out from this page. The accuracy of the instrument depends on a well balanced bridge circuit.

The internal calibration circuit is not used in this case. You will receive free consultation on any problem you might encounter in the assembly or use of your Heathkit product. Figure 5 shows the effect of increasing cable losses caused by various values of SWR.

See inset drawing 1 and Detail 6A. Where a wire passes through a connection and then goes to another point, as in the next step, it will count as two wires in the solder instructions S-2one entering and one leaving the connection. Look up this Description in the “Parts List.

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. When the load is matched, the SWR will be low, approaching 1: Ferrite beads Bulletims through L6 prevent RF from traveling through the cable into the readout circuits.