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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Otherwise, use the 14 pF capacitor. Assembly and Operation of the. Please do not send parts for testing, unless this hm-102 specifically requested by our Nm-2102. Back to home page Return to top. Add to watch list Remove from watch list. Watch list is full. This reading should be at or near zero. 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.
Mount the meter at AE; use the meter hardware as bulletni in Detail 4C. Almost all SWR meters of this vintage work the same way. Position the solder lug as shown in Pictorial 4. This condition provides the greatest accuracy for Power Meter measurements. This amount is subject to change until you make payment.
Install the white wire and bead combination at C S This modification should only be done on units which have a glass epoxy board. A cross pointer meter which reads forward power heathoit reflected power at the same time and also indicates SWR is much easier to use.
Detail 4E Refer to Detail 4E and prepare both ends of the long cable as shown. Resume making your offerif the page does not update immediately. Save one of the excess lead lengths for use heathklt later steps.
I need help setting the swr sensitivity. Pictorial shows foil side of board.
Physical Placement and Losses The detector unit may be removed from the cabinet and placed at a location more convenient for connection to your The SWR meter readings may vary if the Meter is placed at different locations in the transmission line, or if the length of the transmission line bullein changed. Ship by prepaid express. Connect the white wire to lug 6 of switch AC S This can be cured by scraping the area around the hole on the ground foil where the small spacer fits, when mounting the long bracket.
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Heathkit Service Bulletins – HG/HL/HM/HN/HO (Complete)
When these losses occur, the RF power is turned into heat in the cable instead of being radiated from the antenna. If you prefer to ship your kit to the factory, attach a letter containing the following information directly to the unit: Refer to Pictorial 6 for the following steps. Solder the four lugs to the foil. The free end will be connected later. Refer to these numbers hk-2102 any communications with the Heath Company about this kit; this assures you that you will receive the most complete and up-to-date information in return.
Before you install ceramic capacitors, remove any insulation from the leads as shown. Interest will be charged to your account from the purchase date if the balance is not paid in full within 6 months. Save a 1″ piece bm-2102 the outer insulation to use later. When in doubt, make measurements at the antenna and at the transmitter, so future changes in the readings will heahtkit meaningful.
VHF Watt Meter HM Amateur-D Heathkit Brand, Heath Co.;
A good ground connection will make calibrating power readings no problem. The interconnecting cord that is furnished may be replaced by a longer one, if this is desired. Or, if you write a letter, include the: Use the Parts Order Form furnished with this kit.
In this case, place the four black screws in a small envelope and tape them to the bottom of the cabinet. Locate the same identification number next to the part on the Schematic. 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. Be sure the twisted pair of leads goes into the center hole. Kit orders and delivery information 1 Credit Replacement Parts Technical Assistance: An item that has been used previously.
The item you’ve selected was not added to your cart. Pickup coil L1 leads reversed C3 improperly connected. To obtain the total loss of your system, add the value from Figure 4 to the value from Figure 5. Twist the bare wire ends tightly and apply a small amount of solder to each end to hold the small strands together.
VHF Watt Meter HM-2102
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. Ferrite beads L2 through L6 prevent RF from traveling through the cable into the readout circuits.
If the heahkit 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. Position the slotted hole as shown.
Please do not return parts to the factory unless they are requested. Input and output plugs reversed.