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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VHF Watt Meter HM-2102

Normal Operating Characteristics The peaks on controlled carrier modulation will “kick” the meter needle upward. Make these final adjustments carefully and precisely.

Just drop us a line hk-2102 give us a call. Now determine the additional loss caused by the SWR from Figure 5 as follows: Solder the four lugs to the foil.

Make sure the meter top is parallel with the top of the panel. Check the equipment to see that all screws and parts are secured. For this reason, assume that the highest SWR reading is most correct. Figure 5 shows the effect of increasing cable losses caused by various values of SWR.

Full text of “Heathkit HM VHF Wattmeter (manual)”

Insert this lead into the center pin of connector B S I dont reset sensitivity each time. Input and output plugs reversed. If the meter reads higher than 1. You can obtain parts hj-2102 from Heath Company by writing us or telephoning us at This amount is subject to change until you make payment. With a pair of long-nose pliers pull the wires out of the outer insulation.

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Mount the meter at AE; bulletin the meter hardware as shown in Detail 4C.

In a similar manner, mount a coaxial connector at B. Solder all leads to the foil and cut off the excess lead lengths. Pull the bracket down as far as it will go, as shown, before tightening the screws.

Input a low level carrier 10 watts or so into the SWR meter connected to a dummy load or antenna. Someone who is not familiar with the unit may notice something consistently overlooked by the constructor. Our warranty, both express and implied, does not cover damage caused by use of corrosive solder, defective tools, incorrect assembly, misuse, fire, customer-made modifications, flood or acts of God, nor does it include re-imbursement for customer assembly or set-up time.

Heathkit Assembly Manual HM VHF Wattmeter – Manual Only – | eBay

This prevents the transmitted frequency from affecting the wattmeter. Do not include any wooden cabinets or color television picture tubes, as these are easily damaged in shipment. Therefore, if you are using a transmission line long enough to have appreciable losses, locate the Wattmeter near the antenna, especially when adjusting beams or tuning traps.

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With a low SWR, the load that the transmitter sees is practically pure resistive. New 16 pF and 17 pF capacitors will be in the line in the future and this modification may be used until the new capacitors are available.

Forward and reverse voltages are connected to the meter through switch S2, Sensitivity control R9, and Function switch S3. For warranty parts replacement, supply a copy of the invoice or sales slip.

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

If you wish to place the remote chassis in some location away from the cabinet, so the remote unit will be near the transmission lines, do not complete the following steps.

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. Then twist the wire ends tightly and apply a small amount of solder to each end to hold the together.

Use additional packing material where there are protrusions control sticks, large knobs, etc. Refer to Pictorial 7 for the following steps.