GPG-2B

5/8 Wave Ground Plane for 142 -185 MHz

308 Industrial Park Road

Starkville, MS 39759 USA

P h:

(662) 323 -953 8 F AX: (662) 32 3-655 1

INSTRUCTION MANUAL

GENERAL DESCRIPTION

The Model GPG-2B is a 5/8 wave gain ground plane which covers the frequency range of

142-185 MHz. The design is optimized for maximum performance in the 2-meter Amateur band (144-148 MHz), and provides 3.4 dB gain over a 1/4 wave ground plane antenna.

The GPG-2B, when tuned for a specific frequency within 142-185 MHz will have a

VSWR at resonance of less than 1.4:1. Typical

VSWR at resonance within the 2-meter

Amateur band is less than 1.2:1. The 2:1

VSWR bandwidth is greater than 4 MHz.

The GPG-2B will mount on mast sizes up to 1

5/8 inches in diameter.

This antenna is designed to be fed with any standard 50 ohm coaxial cable, but for runs over 50 feet, RG-213/U is recommended because of its lower losses and higher power

The mechanical strength of the GPG-2B has been greatly improved over previous models.

Also, stainless steel hardware is used in most places on this antenna.

Figure 1

Overall View - GPG-2B

SPECIFICATIONS

VSWR at Resonance................................................................................. less than 1.4:1

Power Gain .... ...

Power Input..... ..

.... ................................................... 3.4 dB over quarter wave

................................................................................100 watts'

Lightning Protection . ........................................................................... DC ground

Height(nominal).........

... ..............................................................................50 inches

Wind Area.............

....................................................................0.30 sq. ft. (.03 sq m.)

Maiximum Mast OD ...................................…............................................ 15/8 inches

(41.3 mm) Hardware..........................................................................18-8 stainless steel

ASSEMBLY

Unpack the antenna and check the parts against the Parts List and drawings.

Remove the two (2) screws that are placed through the base insulator assembly to hold it to the bracket and install the four radials as shown in Figure 2.

CAUTION''

Do not rotate the base insulator when orienting' radials. Breakage of wire can occur. It is best to always leave one screw in place while installing the radials.

Insert the 3/8" diameter upper radiator into

the top of the lower radiator.

Assemble the 1/2" compression clamp and slide it into position on the 7/16" tube. See

Figures 2 and 3.

Adjust the total length of the radiator to the dimension shown in Figure 4 for the frequency you wish to use. Tighten the compression clamp securely.

Place the 3/8" caplug on the top of the 3/8" radiator.

Make sure the radials are positioned as shown in Figure 1 and tighten securely.

Attach the antenna to a 1 5/8" mast (not supplied) using the U-bolt supplied.

NOTE: If the input terminals are checked with an. ohmmeter, they will show a direct short.

THIS IS NORMAL! The. matching device in the antenna base puts the entire structure at DC ground but presents 50 ohm impedance to rf energy.

For proper lightning protection and to insure noise-free operation, the antenna supporting structure must be grounded.

Figure 4

Frequency Adjustment Chart

Figure 3

One-Half Inch Compression Clamp Detail

Parts List

Note: The radiator should be set for a length of 48 inches to cover the entire 2 meter Amateur band. If operating frequency above Amateur band is desired, it maybe necessary to trim the upper radiator shorter. This will allow the entire

GPG-2 radiator to be set to the correct length for the desire operation frequency.

Part No.

Description Qty

871674 BaseAssembly,GPG-2B w/lower assembly ………..........................................1

179690 Radials, GPG-2B…...………………………………..........................................4

175030 Radiator, 3/8" diameter upper radiator...........……...........................................1

871675-1 Parts Pack, GPG-2B .......................................................................................1

455655 Caplug, 3/8........................…….......................................................................1

543792 U-bolt, 5/16" x 15/8" x 2 1/4"……............. ....................................................1

555747 Nut, 5/16" - 18 hex ............................……......................................................2

554071 Nut, #10-24, hex ...................…......................................................................5

567080 Lockwasher, 5/16", split..................................................................................2

565697 Lockwasher, #10, internal ..............................................................................5

165123 Compression Clamp, 1/2..................................................................................1

555693 Nut, #10-24, square.........................................................................................1

505692 Screw, # 10 x 3/8", round head ......................................................................2

505751 Screw, # 10x 3/4", round head.........................................................................2

LIMITED WARRANTY

Hy-Gain Warrants to the original owner of this product, if manufactured by Hy-Gain and purchased from an authorized dealer or directly from Hy-Gain to be free from defects in material and workmanship for a period of 12 months for rotator products and

24 months for antenna products from date of purchase provided the following terms of this warranty are satisfied.

1. The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit card or money order receipt, etc.) describing the product to establish the validity of the warranty claim and submit the original or machine reproduction of such proof of-purchase to Hy-Gain at the time of warranty service. Hy-Gain shall have the discretion to deny warranty without dated proof-of-purchase. Any evidence of alteration, erasure, or forgery shall be cause to void any and all warranty terms immediately.

2. Hy-Gain agrees to repair or replace at Hy-Gain’s option without charge to the original owner any defective product under warranty, provided the product is returned postage prepaid to Hy-Gain with a personal check, cashiers check, or money order for $8.00 covering postage and handling.

3. Under no circumstances is Hy-Gain liable for consequential damages to person or property by the use of any Hy-Gain products.

4. Out-of-warranty Service: Hy-Gain will repair any out-of-warranty product provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner. Repair charges will be added to the COD fee unless other arrangements are made.

5. This warranty is given in lieu of any other warranty expressed or implied.

6. Hy-Gain reserves the right to make changes or improvements in design or manufacture without incurring any obligation to install such changes upon any of the products previously manufactured.

7. All Hy-Gain products to be serviced in-warranty or out-of-warranty should be addressed to

hy-gain, 308 Industrial Park Road,

Mississippi 39759, USA

and must be accompanied by a letter describing the problem in detail along with a copy of your dated proof-of-purchase.

8. This warranty gives you specific rights, and you may also have other rights which vary from state to state.