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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Apply power to the transmitter and tune it for maximum RF output reading.
Full text of “Heathkit HM VHF Wattmeter (manual)”
Place C-2A close to foil side of board, solder to leads of C-2 and foil pads, then cut off excess lead length. When operating SSB, any indication with no modulation indicates hezthkit or parasitic emission, or poor carrier suppression.
Note the external wattmeter reading. The wattmeter is calibrated by measuring the voltage at control R6, which varies the current going to the meter. For this reason, assume that the highest SWR reading is most correct.
When in doubt, make measurements at the antenna and at the transmitter, so future changes in the readings will be meaningful. Detail 4E Refer to Detail 4E and prepare both ends of the long cable as shown.
Remove and discard the shorting wire from the meter terminals. You may even position the detector unit at the heatthkit, although there is always the possibility of RF pickup on the extended interconnecting cable from ym-2102 transmission line.
Connect the black wire to the negative unmarked meter lug S By looking at this same level on the left-hand side of the chart, you can read the dB loss per feet of the cable at that frequency.
For warranty parts replacement, supply a copy of the invoice or sales slip. Insert the other end through hole K on the circuit board and solder it to the foil. Subject to credit approval.
The item you’ve selected was not added to your cart. 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.
Sorry, we cannot accept collect calls. Make sure the meter top is parallel with the top of the panel. The SWR can only be changed by changing the load or termination at the cable. Solder the leads to the foil and cut off the excess lead lengths. heathkir
VHF Watt Meter HM-2102
Use the amount of loss determined from Figure 4 and find this value on the bottom line of Figure ueathkit. Get the manual from BAMA or e-mail me at mycall arrl. Input and output plugs reversed. The blue and white label shows the model number and production series number of your kit. The remote cabinet is not weatherproof ed.
Heathkit Service Bulletins – HG/HL/HM/HN/HO (Complete)
He’ll make certain your problems receive immediate, personal attention. If you prefer to ship your kit to the factory, attach a letter containing the following information directly to the unit: Forward and reverse voltages are connected to the meter through switch S2, Sensitivity control R9, and Function switch S3.
Position the three toroid coil leads as shown, vulletins push the leads through the circuit board. Solder the wire to the foil. Do not heathoit the meter nuts, as the meter case can be broken. Back to home page.
No additional import charges at delivery! Diode D1 or D2 reversed. Be sure to tell us: Then, with pliers, insert the strain relief in the hole. The item may have some signs of cosmetic wear, but is fully operational and functions as intended.