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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Search the history of over billion web pages on the Internet. Replacement parts are maintained specifically to repair Heathkit products.

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

A minor “touch-up” tuning of the transmitter may show an increase on heahtkit Meter. This Wattmeter may be permanently installed in your transmission line and needs no other power source.

RFS 15′ FT 4. If it is not, adjust the screw on the meter case slightly to position the needle over the zero. Assembly and Operation of the.

Connect the other lead of this capacitor to the hole in the foil outlined in Pictorial 6 S Zero the meter with the knob, then push the knob back in – without changing its rotation at all. Use a 6 solder lug at AA in place of a 6 lockwasher. Have one to sell?

Minimum monthly payments are required. Refer to Pictorial 7 for the following steps. However, the accuracy of the external wattmeter will determine how accurate your Wattmeter will be.

SWR Sensitivity Less than 1 0 watts. See all condition definitions – opens in a new window or tab With a pair of long-nose pliers pull the wires out of the outer insulation.


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

Apply power to the transmitter and tune it for bu,letin RF output reading. Remove and discard the shorting wire from the meter terminals. You will receive free consultation on any problem you might encounter in the assembly or use of your Heathkit product. This condition provides the greatest accuracy for Power Meter measurements. A transmitted signal routed along this wire induces a current in coil L1.

Note the external wattmeter reading. Therefore, scrape away the colored protective bhlletin from the foil where the small spacer will contact it. Connect this wire from the center pin of connector B NSthrough the eyelet in the circuit board, and into the center pin dip of connector A NS.

Turn the SWR Sens control shaft fully counterclockwise. 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.

Heathkut C16 being replaced on the foil side of Circuit Board.

Parts sales for other reasons will be declined. SWR Bridge Continuous to watts. We suggest that you wear glasses, or at least clip the leads so the ends will not fly toward your eyes. The shorting wire will be removed later. Follow the instructions carefully and read the entire step before performing the operation.

This completes the “Step-by-Step Assembly. Diode D1 or D2 reversed.

Heathkit HM SWR Meter

United Parcel Service, or insured Parcel Post to: The item may have some signs of cosmetic wear, but is fully operational and functions as intended. The lead coming from the top of the coil must go to the hole nearest D3, and the lead from the bottom must go to the hole nearest D2.


Learn More – opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc. The internal calibration circuit is not used in this case.

Insert this lead into the center pin of connector B S It will not work on transmission lines that are used as tuned feeders, since tuned feeders normally have a high SWR.

The Heath Company reserves the right to discontinue instruments and to change specifications at any time without incurring any obligation to incorporate new features in instruments previously sold. Coil the cable neatly and slide it into the opening beneath the remote unit. If it is convenient, personally deliver your kit to a Heathkit Electronic Ueathkit.

Cut 4″ from one end of the cable. Improper load on wattmeter. Connect the white wire to lug bullegin of switch AC S Remember, the carrier will not accept liability for shipping damage if the unit is insufficiently packed.

VHF Watt Meter HM-2102

Sorry, we cannot accept collect calls. This indicates a closer match between the transmitter and the transmission line.

Then, push the end of the black wire through hole H until the ferrite bead is down against the component side of the circuit board.

Then tune the transmitter and watch the RF Power Meter needle move up-scale.